Ensure that LCP names are globally unique (between interface/sub-interface/loopback/bridgedomain)

unittest/correct-bridgedomain.yaml

@@ -55,4 +55,4 @@ bridgedomains:
     description: "Bridge Domain 12, LCP but no address"
     mtu: 9000
     interfaces: [ GigabitEthernet4/0/0, GigabitEthernet4/0/1 ]
-    lcp: "bvi11"
+    lcp: "bvi12"

unittest/error-lcp-unique1.yaml

@@ -0,0 +1,18 @@
+test:
+  description: "Two interfaces or subinterfaces can't have the same LCP"
+  errors:
+    expected:
+     - "interface .* does not have a unique LCP name"
+     - "sub-interface .* does not have a unique LCP name"
+    count: 3
+---
+interfaces:
+  GigabitEthernet1/0/0:
+    lcp: "e1"
+    sub-interfaces:
+      100:
+        lcp: "e1"
+
+  GigabitEthernet1/0/1:
+    lcp: "e1"
+

unittest/error-lcp-unique2.yaml

@@ -0,0 +1,26 @@
+test:
+  description: "Loopback and BridgeDomain and Interfaces can't have the same LCP"
+  errors:
+    expected:
+     - "interface .* does not have a unique LCP name"
+     - "loopback .* does not have a unique LCP name"
+     - "bridgedomain .* does not have a unique LCP name"
+    count: 3
+---
+interfaces:
+  GigabitEthernet1/0/0:
+    lcp: "e1"
+
+  GigabitEthernet2/0/0:
+    mtu: 1500
+  GigabitEthernet2/0/1:
+    mtu: 1500
+
+loopbacks:
+  loop0:
+    lcp: "e1"
+
+bridgedomains:
+  bd0:
+    lcp: "e1"
+    interfaces: [ GigabitEthernet2/0/0, GigabitEthernet2/0/1 ]