Services split, pass 2

- Nuke more services code, killing some refs in vmware plugin
- Vmware plugin foreign key relationships are temporary disabled
- Vmware unit tests are temporarily disabled
- Remove router insertion test, as its only user is going away
- Add thin service plugin shims
- Temporarily disable model sync test

Post services-split, existing neutron.conf configurations may contain
references to in-tree plugin classes.  Add thin shims so that those configs
will continue to work.

Change-Id: I5dd26def685bcc643e35badc23885afc6240ae94
Merge "Services split, pass 2"