Add support for router scheduling in Cisco N1kv Plugin

Added functionality for router and network scheduling
in Cisco N1kv Plugin.

Change-Id: I1a8d27670d10ca26fb62a8d02230a1aaf3e7bbca
Closes-Bug: #1286412
Clean out namespaces even if we don't delete namespaces

Even when we don't enable namespace deletion, we still want to run the
code that cleans out the namespaces so that the devices get unplugged,
etc.  Otherwise, routers deleted while the agent is down will continue
to operate as if they were never deleted.

The trade-off to consider here is that if there are many stale
namespaces this will slow down the restart of the L3 agent.  The best
option is to get namespace deletion working correctly.  However, where
that has not been worked out yet, this patch provides the cleaning
service for deleted routers.

Change-Id: Ic7b4608a23c4d9530f521d5faff3f8526200b92e
Closes-Bug: #1301042
Related-Bug: #1052535
BSN: Remove module-level ref to httplib method

Removes a module-level variable that was just a
pointer to the httplib.HTTPConnection class. It's
purpose was to give mock.patch a target that wouldn't
affect other code using the httplib.HTTPConnection
library. However, it is unnecessary now that the
root cause of the original patches not being stopped
by mock.patch.stopall was fixed in bug 1303605 (change
Ia5b374c5f8d3a7905d915de4f1f8d4f3a6f0e58d).

Closes-Bug: #1304558
Change-Id: Idf814b075a80245bb9751466c2b58d719a1b81f3
Merge "Add support for router scheduling in Cisco N1kv Plugin"
Merge "BSN: Remove module-level ref to httplib method"
Merge "Clean out namespaces even if we don't delete namespaces"