Repair pcep-topology-provider-config to work with MD5 wiring

Fix scope of test dependencies, use correct API to
lookup dependent bean attributes - dependencyResolver.getAttribute
instead of platform mbean server.
Extend test to instantiate md5 infrastructure to test custom validation.

Change-Id: I856ee8f529415866c0747b9a4a6dbf5a102b9e54
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>
Merge "Repair pcep-topology-provider-config to work with MD5 wiring"