Fix header for the output table following 'show ipv6 interface' command (#2219)

- What I did
Fix the header for "show ipv6 interface" output that display "IPv4" instead of "IPv6"
This PR fix the following issue: sonic-net/sonic-buildimage#11124

- How I did it
Check if the table is for IPv4 or IPv6 and present the header accordingly. In addition, adjust the UT

- How to verify it
Run "show ip interface" CLi command and verify that the output header present "IPv4"
Run "show ipv6 interface" CLi command and verify that the output header present "IPv6"

Author: dprital

scripts/ipintutil

@@ -192,9 +192,13 @@ def get_ip_intfs_in_namespace(af, namespace, display):
     return ip_intfs
 
 
-def display_ip_intfs(ip_intfs):
+def display_ip_intfs(ip_intfs,address_family):
     header = ['Interface', 'Master', 'IPv4 address/mask',
               'Admin/Oper', 'BGP Neighbor', 'Neighbor IP']
+
+    if address_family == 'ipv6':
+        header[2] = 'IPv6 address/mask'
+    
     data = []
     for ip_intf, v in natsorted(ip_intfs.items()):
         ip_address = v['ipaddr'][0][1]
@@ -264,7 +268,7 @@ def main():
 
     SonicDBConfig.load_sonic_global_db_config()
     ip_intfs = get_ip_intfs(af, namespace, display)
-    display_ip_intfs(ip_intfs)
+    display_ip_intfs(ip_intfs,args.address_family)
 
     sys.exit(0)
 

tests/show_ip_int_test.py

@@ -19,7 +19,7 @@
 Vlan100                    40.1.1.1/24          error/down    N/A             N/A"""
 
 show_ipv6_intf_with_multiple_ips = """\
-Interface        Master    IPv4 address/mask                             Admin/Oper    BGP Neighbor    Neighbor IP
+Interface        Master    IPv6 address/mask                             Admin/Oper    BGP Neighbor    Neighbor IP
 ---------------  --------  --------------------------------------------  ------------  --------------  -------------
 Ethernet0                  2100::1/64                                    error/down    N/A             N/A
                            aa00::1/64                                                  N/A             N/A
@@ -36,7 +36,7 @@
 PortChannel0001            20.1.1.1/24          error/down    T2-Peer         20.1.1.5"""
 
 show_multi_asic_ipv6_intf = """\
-Interface        Master    IPv4 address/mask                       Admin/Oper    BGP Neighbor    Neighbor IP
+Interface        Master    IPv6 address/mask                       Admin/Oper    BGP Neighbor    Neighbor IP
 ---------------  --------  --------------------------------------  ------------  --------------  -------------
 Loopback0                  fe80::60a5:9dff:fef4:1696%Loopback0/64  error/down    N/A             N/A
 PortChannel0001            aa00::1/64                              error/down    N/A             N/A
@@ -54,7 +54,7 @@
 veth@eth2                  193.1.1.1/24         error/down    N/A             N/A"""
 
 show_multi_asic_ipv6_intf_all = """\
-Interface        Master    IPv4 address/mask                       Admin/Oper    BGP Neighbor    Neighbor IP
+Interface        Master    IPv6 address/mask                       Admin/Oper    BGP Neighbor    Neighbor IP
 ---------------  --------  --------------------------------------  ------------  --------------  -------------
 Loopback0                  fe80::60a5:9dff:fef4:1696%Loopback0/64  error/down    N/A             N/A
 PortChannel0001            aa00::1/64                              error/down    N/A             N/A