Convert PCEP extensions to blueprint

Convert PCEP extensions to blueprint

Added blueprint XML file, pcep-spi.xml, to the spi bundle that utilizes
the blueprint extension, "specific-reference-list" , to obtain the
specific list of PCEPExtensionProviderActivator OSGi service instances.
The specific expected services are announced via
META-INF/services/org.opendaylight.protocol.pcep.spi.PCEPExtensionProviderActivator
resources in the provider bundles which the "specific-reference-list"
extension scan so it knows which services to look for. Once all expected
services are obtained, the PCEPExtensionProviderActivator instance List
bean is created and injected into the SimplePCEPExtensionProviderContextActivator
bean instance which calls start on each.

All 6 PCEPExtensionProviderActivator implementations, base-parser,
auto-bandwidth, segment-routing, and 3 in ietf-stateful07, now created via
new blueprint XML files and the corresponding config yang and associated Module
class were removed.

The SimplePCEPExtensionProviderContextModule was deprecated but still
remains for now to provide the PCEPExtensionProviderContext instance
created via blueprint to the config system so it can be injected into
other users. Once the other user(s) are converted to blueprint then the
config yang, Module classes can be removed.

Change-Id: I71193376f762975f775d1a5a6cee0f7702b525b2
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>