Update netconf RN for removed CSS modules

Update netconf RN for removed CSS modules

- removal of the deprecated CSS netconf mounting
- conversion of sal-rest-connector to blueprint
- conversion of netconf yanglib to blueprint

I also changed the Feature URLs to the appropriate pom file b/c,
with karaf4, the feature.xml files are generated by the pom so
they don't actually exist in git anymore. I'm not sure if
referencing the pom is the best way but not sure of
alternative.

Change-Id: Ic104802be504f3974c2ceb96f3b083e4c6db71f2
Signed-off-by: Tom Pantelis <tompantelis@gmail.com>