Removed push sources, collapsed pull sources, registry lookup misses throw exception
sources re-obtained each per-request; simplified source config updating
Collapsing source.api package
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License headers.
Merge pull request #847 from sonatype/NEXUS-7629-source-simplification

Merged.
NEXUS-7653: re-enable Karaf's shutdown port, but disable it during ITs as it can cause random port clashes