Fix resource-assignment dependencies

Fix resource-assignment dependencies

Resource-assignment was not loading due to unresolved dependencies.  This
turned out to be due to a few issues, addressed by this change:

- commons-lang had to be added as a bundle in features.xml
- package name for DbLibService in spring config was wrong, preventing
spring from initializing properly
- DbLibService's package (org.onap.ccsdk.sli.core.dblib) was not detected
properly by felix maven plugin and was missing from Import-Package in
MANIFEST. Resolved by explicitly adding that package in felix plugin
config in provider pom.xml

Change-Id: I6ebb82ebae0e96b4ab9592e29f6a7a1d2276aa69
Issue-ID: CCSDK-79
Signed-off-by: Dan Timoney <dtimoney@att.com>