Handle odl-mdsal-common with Karaf 4.0.9

Handle odl-mdsal-common with Karaf 4.0.9

Karaf 4.0.9 simplifies feature dependencies (so that dependencies
specified in feature.xml can be completed from the POM), but that
causes issues with odl-mdsal-common since features in Karaf are
identified by their name only:

* if both the controller odl-mdsal-common and the mdsal
  odl-mdsal-common are encountered in the dependency tree, whichever
  one came first (as dependencies are resolved) is the one that ends
  up being kept;
* in some circumstances, the mdsal repository replaces controller's
  even when the controller dependency is retained (this is a Karaf bug
  which I'll submit a patch for, but we can work around it).

Change-Id: I5400a829560ae96cb2f264e103020cccd1d225c3
Signed-off-by: Stephen Kitt <skitt@redhat.com>