Allow plugins to use self-provided licenses for used Maven Jars

maven_jar only allowed to use licenses that were defined in
'//lib:'. But plugins may need further licenses that are not yet in
core (E.g.: plugins/its-jira relies on a jar with CPL1.0
license). Since, plugins cannot add rules underneath '//lib:', we add
the local_license parameter to maven_jar, which allows plugins to use
licenses from ':' instead of '//lib:'.

Change-Id: Icc40c413eed65a0b6e3003021050d91086ca4c34
1 file changed