Remove the attempted plural 'address(es)', and keep it singular. Fix a typo (addd-ress); update unit tests

unittest/error-bondethernet4.yaml

@@ -2,7 +2,7 @@ test:
   description: "Members of a BondEthernet can't have addresses"
   errors:
     expected:
-     - "bondethernet .* member .* has address"
+     - "bondethernet .* member .* has an address"
      - "bondethernet .* member .* has an LCP"
     count: 2
 ---

unittest/error-bridgedomain3.yaml

@@ -2,8 +2,8 @@ test:
   description: "Interfaces put into the bridge, can't be L3 (so cannot have an address)"
   errors:
     expected:
-     - "interface .* has adddress.* but no LCP"
-     - "sub-interface .* has address.* but .* does not have LCP"
+     - "interface .* has an address but no LCP"
+     - "sub-interface .* has an address but .* does not have LCP"
      - "bridgedomain .* member .* has an address"
     count: 6
 ---

unittest/error-subinterface5.yaml

@@ -2,7 +2,7 @@ test:
   description: "Sub-interface with addresses must have an LCP. Gi1/0/0 does this wrong, while Gi2/0/0 does it correctly"
   errors:
     expected:
-     - "sub-interface .* has address.* but .* does not have LCP"
+     - "sub-interface .* has an address but .* does not have LCP"
 ---
 interfaces:
   GigabitEthernet1/0/0: