REVIEW: [NXCM-5196] Read version from "/META-INF/nexus/nexus-bundle.properties" ...

...if file is available (only in bundles build by nexus-bundles project). Otherwise, fallback to maven pom.properties (as before)

https://issues.sonatype.org/browse/NXCM-5196
https://bamboo.zion.sonatype.com/browse/NXO-OSSF27