aruba_aoscx_show_interface_mgmt: add fixture covering populated nameservers and IPv4 gateway

Author: julmanglano

tests/aruba_aoscx/show_interface_mgmt/show_interface_mgmt3.raw

@@ -0,0 +1,12 @@
+  Address Mode                  : static
+  Admin State                   : up
+  Link State                    : up
+  Mac Address                   : 9c:37:08:aa:bb:cc
+  IPv4 address/subnet-mask      : 192.0.2.1/25
+  Default gateway IPv4          : 192.0.2.126
+  IPv6 address/prefix           :
+  IPv6 link local address/prefix: fe80::aabb:ccdd:eeff:33/64
+  Default gateway IPv6          :
+  Primary Nameserver            : 203.0.113.1
+  Secondary Nameserver          : 203.0.113.2
+  Tertiary Nameserver           :

tests/aruba_aoscx/show_interface_mgmt/show_interface_mgmt3.yml

@@ -0,0 +1,17 @@
+---
+parsed_sample:
+  - address_mode: "static"
+    admin_state: "up"
+    ipv4_address: "192.0.2.1"
+    ipv4_gateway: "192.0.2.126"
+    ipv4_prefix_length: "25"
+    ipv6_address: ""
+    ipv6_gateway: ""
+    ipv6_link_local: "fe80::aabb:ccdd:eeff:33"
+    ipv6_link_local_prefix_length: "64"
+    ipv6_prefix_length: ""
+    link_state: "up"
+    mac_address: "9c:37:08:aa:bb:cc"
+    primary_dns: "203.0.113.1"
+    secondary_dns: "203.0.113.2"
+    tertiary_dns: ""