Add unit tests for bondethernet, including a set of correctly form ones

unittest/correct-bondethernet.yaml

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+test:
+  description: "An example of well formed bondethernet"
+  errors:
+    count: 0
+---
+bondethernets:
+  BondEthernet0:
+    interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1 ]
+  BondEthernet1:
+    interfaces: [ GigabitEthernet2/0/0, GigabitEthernet2/0/1 ]
+
+interfaces:
+  GigabitEthernet1/0/0:
+    mtu: 3000
+  GigabitEthernet1/0/1:
+    mtu: 3000
+
+  GigabitEthernet2/0/0:
+    mtu: 3000
+  GigabitEthernet2/0/1:
+    mtu: 3000
+
+  BondEthernet0:
+    mtu: 3000
+    sub-interfaces:
+      100:
+        mtu: 2000
+
+  BondEthernet1:
+    mtu: 3000
+    lcp: "be0"
+    addresses: [ 192.0.2.1/29, 2001:db8::1/64 ]
+    sub-interfaces:
+      100:
+        mtu: 2000
+        addresses: [ 192.0.2.9/29, 2001:db8:1::1/64 ]

unittest/error-bondethernet1.yaml

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+test:
+  description: "Members of a BondEthernet must exist"
+  errors:
+    expected:
+     - "bondethernet .* member .* doesn't exist"
+    count: 2
+---
+bondethernets:
+  BondEthernet0:
+    interfaces: [ GigabitEthernet2/0/0, GigabitEthernet2/0/1 ]
+
+interfaces:
+  GigabitEthernet1/0/0:
+    mtu: 3000
+  GigabitEthernet1/0/1:
+    mtu: 3000
+
+  BondEthernet0:
+    mtu: 3000

unittest/error-bondethernet2.yaml

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+test:
+  description: "Members of a BondEthernet can't have a sub-interface"
+  errors:
+    expected:
+     - "bondethernet .* member .* has sub-interface"
+    count: 1
+---
+bondethernets:
+  BondEthernet0:
+    interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1 ]
+
+interfaces:
+  GigabitEthernet1/0/0:
+    mtu: 3000
+    sub-interfaces:
+      100:
+        description: "A sub-int on a BondEthernet member is not OK"
+  GigabitEthernet1/0/1:
+    mtu: 3000
+
+  BondEthernet0:
+    mtu: 3000

unittest/error-bondethernet3.yaml

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+test:
+  description: "Members of a BondEthernet can't have an LCP"
+  errors:
+    expected:
+     - "bondethernet .* member .* has an LCP"
+    count: 1
+---
+bondethernets:
+  BondEthernet0:
+    interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1 ]
+
+interfaces:
+  GigabitEthernet1/0/0:
+    mtu: 3000
+    lcp: "e1-0-0"
+  GigabitEthernet1/0/1:
+    mtu: 3000
+
+  BondEthernet0:
+    mtu: 3000

unittest/error-bondethernet4.yaml

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+test:
+  description: "Members of a BondEthernet can't have addresses"
+  errors:
+    expected:
+     - "bondethernet .* member .* has address"
+     - "bondethernet .* member .* has an LCP"
+    count: 2
+---
+bondethernets:
+  BondEthernet0:
+    interfaces: [ GigabitEthernet1/0/0, GigabitEthernet1/0/1 ]
+
+interfaces:
+  GigabitEthernet1/0/0:
+    mtu: 3000
+    lcp: "e1-0-0"
+    addresses: [ 192.0.2.1/29 ]
+  GigabitEthernet1/0/1:
+    mtu: 3000
+
+  BondEthernet0:
+    mtu: 3000