Fix tests after md-sal's bundlecontext refactoring

Explicitly invoke GlobalBundleScanningSchemaServiceImpl's
createInstance and destroyInstance in tests that need it.

Change-Id: I3297265ed2191d2a8ecdaa92c9fb318b0a36f180
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>