Migrate to Al and reactivate some Junit tests

Migrate to Al and reactivate some Junit tests

  - Use of BindingDOMCodecServices in DataStoreContext
  - remove @Ignore decorator and fix unit tests when needed

This commit reintroduces the import of mdsal.binding.dom.codec.impl
.BindingCodecContext in common/src/main/[..]/DataStoreContextImpl.java.
This dependency was preventing karaf from starting up correctly and was
removed previously in commit 243c08d8b7ad90b0cbaec76a33a639d6fa96f5c8

Since DataStoreContext is no more used outside of the test scope,
common/src/main/[..]/DataStoreContext.java and friends have been moved
into test-common before reintroducing this import.
They are now only used in test scope / build time.
This way, the karaf start-up problem is avoided.

JIRA: TRNSPRTPCE-305
Change-Id: I246a9d58879be047c470f8a683993bc81d3a54a3
Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>