Fix test failures in sal-binding-it
With the recent blueprint patch, the sal-binding-it integration tests
are failing in merge jobs (they don't run on veriy jobs) b/c they don't
install the blueprint bundle. I cobverted them from using the deprecated
TestHelper, which installs bundles, to using AbstractMdsalTestBase which
which installs features.
Also fixed a race condition in BindingToNormalizedNodeCodecFactory founf
when running the tests.
Change-Id: I06bbc33e7dbcb0bff557daccd8e1d87103bebc7d
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>