Deprecate old vif drivers.

As per commit 4c0cecd3 (Change-Id I292c2fd7aa0c32b1c91d737152ed8e54ea2cf6ac)
Deprecate:
* LibvirtBridgeDriver
* LibvirtOpenVswitchDriver
* LibvirtHybridOVSBridgeDriver
* LibvirtOpenVswitchVirtualPortDriver
* QuantumLinuxBridgeVIFDriver

Change-Id: Iad854dfe91aaa18622f78aa92746d3ea2f986960
hypervisor tests more accurate db

The hypervisor tests don't accurately model the db because the
sqlalchemy DB API requires admin for the compute_node_get_all
function.

This change makes it so that the fake compute_node_get_all
function in the hypervisor test module requires admin just like the
sqlalchemy DB function.

Change-Id: I5acd45cfbd10ec06d8c5a9425e9c6ed18cff669e
Translate cinder NotFound exception

When we attempt to get information about a snapshot
which doesn't exist we get a cinder NotFound exception.
However, this is not caught and causes a stacktrace in the logs.
This occurs on every tempest run in the test
EC2VolumesTest.test_create_volume_from_snapshot.

The fix is to translate the exception to SnapshotNotFound
which is handled correctly further up the call chain.

Fixes bug 1169777

Part of blueprint no-stacktraces-in-logs

Change-Id: If893b5083b93894e671c978bd23bd89d3d017531
Merge "Deprecate old vif drivers."
Merge "hypervisor tests more accurate db"
Merge "Translate cinder NotFound exception"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp