LBaaS VIP doesn't work after delete and re-add

When delete and re-add the same vip, we need to send gratuitous ARP
to flush the ARP cache in the Router.

Change-Id: Id97088abb95f4433a100abdae8c8726b3be42ed2
Closes-Bug: 1301165
Fix issubclass() hook behavior in PluginInterface

Currently, PluginInterface provides an issubclass() hook that returns
True for issubclass(A, B) call, if all abstract methods of B (stored
in B.__abstractmethods__) can be found in the A.__mro__ tuple of
classes. But there is an edge case, when B doesn't have any abstract
methods, which leads to issubclass(A, B) call returning True even if
A and B are not related all.

E.g. issubclass(NeutronPluginPLUMgridV2, NsxPlugin) returns True,
while these two are different core plugins. And it gets even more
trickier when superclasses are involved: e.g. SecurityGroupDbMixin is
a superclass of NsxPlugin, so depending on the fact whether the
python module with NsxPlugin class is imported or not,
issubclass(NeutronPluginPLUMgridV2, SecurityGroupDbMixin) will return
either False or True accordingly.

Closes-Bug: #1308489

Change-Id: I92711a00a19b89729ccdba9cbd8a2e7a2d2868ed
Add mailmap entry

Add mailmap entry for my email address

Change-Id: Ia46c28c86ef3f440556b1b027d2bf0a7f3e721c5
Merge "Add mailmap entry"
Merge "LBaaS VIP doesn't work after delete and re-add"
Merge "Fix issubclass() hook behavior in PluginInterface"