Expand autocreated LCP namelen to all possible (dot1q, qin*) scenarios. Allow manually set LCP to be 15char in length

unittest/error-schema-field2.yaml

@@ -4,7 +4,8 @@ test:
     expected:
      - "yamale: .* is not a "
      - "yamale: .*: Unexpected element"
-    count: 12
+     - "Length of .* is greater than 15"
+    count: 13
 ---
 interfaces:
   GigabitEthernet1/0/0:
@@ -20,6 +21,7 @@ interfaces:
 
   GigabitEthernet1/0/1:
     mtu: 1500
+    lcp: "a234567890123456"
     sub-interfaces:
       "string":
         description: "the sub-int key should be an int"

unittest/error-subinterface3.yaml

@@ -2,12 +2,23 @@ test:
   description: "The length of the LCP name is too long"
   errors:
     expected:
-     - "Length .* is greater than 8"
+    - "sub-interface .* has LCP with too long name .*"
+    count: 2
 ---
 interfaces:
   GigabitEthernet1/0/0:
-    lcp: "e01234567"
+    lcp: "e23456789012"
     sub-interfaces:
       100:
         description: "VLAN 100"
+  GigabitEthernet1/0/1:
+    lcp: "e2345678"
+    sub-interfaces:
+      100:
+        description: "VLAN 100"
+      101:
+        description: "QinQ 101"
+        encapsulation:
+          dot1q: 100
+          inner-dot1q: 100