[build_template]: combine the init config write into one block (#1513)

Signed-off-by: Sihui Han <[email protected]>

Author: sihuihan88

files/build_templates/sonic_debian_extension.j2

@@ -165,12 +165,7 @@ sudo bash -c "echo dhcp_as_static=true >> $FILESYSTEM_ROOT/etc/sonic/updategraph
 {% else %}
 sudo bash -c "echo enabled=false > $FILESYSTEM_ROOT/etc/sonic/updategraph.conf"
 {% endif %}
-{% if shutdown_bgp_on_start == "y" %}
-sudo bash -c "echo '{ \"DEVICE_METADATA\": { \"localhost\": { \"default_bgp_status\": \"down\" } } }' >> $FILESYSTEM_ROOT/etc/sonic/init_cfg.json"
-{% endif %}
-{% if enable_pfcwd_on_start == "y" %}
-sudo bash -c "echo '{ \"DEVICE_METADATA\": { \"localhost\": { \"default_pfcwd_status\": \"enable\" } } }' >> $FILESYSTEM_ROOT/etc/sonic/init_cfg.json"
-{% endif %}
+sudo bash -c "echo '{ \"DEVICE_METADATA\": { \"localhost\": { \"default_bgp_status\": {% if shutdown_bgp_on_start == "y" %}\"down\"{% else %}\"up\"{% endif %}, \"default_pfcwd_status\": {% if enable_pfcwd_on_start == "y" %}\"enable\"{% else %}\"disable\"{% endif %}  } } }' >> $FILESYSTEM_ROOT/etc/sonic/init_cfg.json"
 
 # Copy SNMP configuration files
 sudo cp $IMAGE_CONFIGS/snmp/snmp.yml $FILESYSTEM_ROOT/etc/sonic/