[yang]Updating vxlan yang model to include IPv6 source in VxLAN tunnel (

#14363)

- Why I did it
Update VxLAN yang model to include IPv6 source in VxLAN tunnel. The src_ip field can include both ipv4 as well as ipv6 address

- How I did it
Updated yang model.

- How to verify it
Added UT to verify

src/sonic-yang-models/tests/yang_model_tests/tests/vxlan.json

@@ -2,6 +2,9 @@
  "VXLAN_VALID_TEST": {
  "desc": "Valid VXLAN Configuration."
  },
+ "VXLAN_VALID_V6_TUNNEL_TEST": {
+ "desc": "Valid VXLAN V6 Configuration."
+ },
  "VXLAN_EVPN_NVO_WITHOUT_VTEP": {
  "desc": "Configure EVPN_NVO without VXLAN_TUNNEL entry",
  "eStrKey" : "LeafRef"

src/sonic-yang-models/tests/yang_model_tests/tests_config/vxlan.json

@@ -38,6 +38,45 @@
  }
  }
  },
+ "VXLAN_VALID_V6_TUNNEL_TEST": {
+ "sonic-vlan:sonic-vlan": {
+ "sonic-vlan:VLAN": {
+ "VLAN_LIST": [
+ {
+ "name": "Vlan100"
+ }
+ ]
+ }
+ },
+ "sonic-vxlan:sonic-vxlan": {
+ "sonic-vxlan:VXLAN_TUNNEL": {
+ "VXLAN_TUNNEL_LIST": [
+ {
+ "name": "vtep1",
+ "src_ip": "2001::1:2:3:4"
+ }
+ ]
+ },
+ "sonic-vxlan:VXLAN_EVPN_NVO": {
+ "VXLAN_EVPN_NVO_LIST": [
+ {
+ "name": "nvo1",
+ "source_vtep": "vtep1"
+ }
+ ]
+ },
+ "sonic-vxlan:VXLAN_TUNNEL_MAP": {
+ "VXLAN_TUNNEL_MAP_LIST": [
+ {
+ "name": "vtep1",
+ "mapname": "map_100_Vlan100",
+ "vlan": "Vlan100",
+ "vni": "100"
+ }
+ ]
+ }
+ }
+ },
  "VXLAN_EVPN_NVO_WITHOUT_VTEP": {
  "sonic-vxlan:sonic-vxlan": {
  "sonic-vxlan:VXLAN_EVPN_NVO": {

src/sonic-yang-models/yang-models/sonic-vxlan.yang

@@ -60,7 +60,7 @@ module sonic-vxlan {
  }
 
  leaf src_ip {
- type inet:ipv4-address;
+ type inet:ip-address;
  }
  }
  }