Fix tests for upcoming LCP assertion that intermediate interfaces 'xe0.1000' must exist as an LCP in order for Qin* sub-interfaces 'xe0.1000.1234' to be allowed

unittest/correct-example1.yaml

@@ -39,6 +39,7 @@ interfaces:
     lcp: "bond0"
     sub-interfaces:
       200:
+        description: "This subint is needed to build the parent LCP bond0.1000 for QinQ subint 202 bond0.1000.1234"
         encapsulation:
           dot1q: 1000
       201:

unittest/error-subinterface4.yaml

@@ -9,6 +9,10 @@ interfaces:
     lcp: "e01234"
     sub-interfaces:
       100:
+        description: "Dot1Q subinterface"
+        encapsulation:
+          dot1q: 1234
+      101:
         description: "QinQ subinterface"
         addresses: [ 192.0.2.1/24 ]
         encapsulation:

unittest/error-subinterface6.yaml

@@ -17,4 +17,3 @@ interfaces:
         encapsulation:
           ## Missing dot1q or dot1ad
           inner-dot1q: 100
-