Removed extra 'ip addr del' on the lo inteface

The 'post-up ip addr del 127.0.0.1/8 dev lo' was thought to be required
when the loopback interface subnet mask was narrowed from /8 to /16.
After testing first reboot, subsequent reboots, config reloads, and
systemctl restart networking on linecards and supevisors (DNX VOQ
chassis), this cleanup command does not appear to be required. As such,
this change removes it as well as reverts
sonic-net#15080.

Author: kenneth-arista

files/image_config/interfaces/interfaces.j2

@@ -25,8 +25,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 {% endblock loopback %}
 {% block mgmt_interface %}
 

src/sonic-config-engine/tests/sample_output/py2/interfaces

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/interfaces_nomgmt

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/interfaces_nomgmt_ztp

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/interfaces_nomgmt_ztp_inband

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/interfaces_nomgmt_ztp_inband_ip

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/interfaces_nomgmt_ztp_ip

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/mvrf_interfaces

@@ -18,8 +18,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/mvrf_interfaces_nomgmt

@@ -18,8 +18,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py2/two_mgmt_interfaces

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth1

src/sonic-config-engine/tests/sample_output/py3/interfaces

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/interfaces_nomgmt

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/interfaces_nomgmt_ztp

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/interfaces_nomgmt_ztp_inband

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/interfaces_nomgmt_ztp_inband_ip

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/interfaces_nomgmt_ztp_ip

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/mvrf_interfaces

@@ -18,8 +18,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/mvrf_interfaces_nomgmt

@@ -18,8 +18,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0

src/sonic-config-engine/tests/sample_output/py3/two_mgmt_interfaces

@@ -9,8 +9,6 @@ iface lo inet loopback
    address 127.0.0.1
    netmask 255.255.0.0
    scope host
-   post-up ip addr del 127.0.0.1/8 dev lo
-   down ip addr add 127.0.0.1/8 dev lo
 
 # The management network interface
 auto eth0