NEXUS-6863: Make failure propagate to the client
NEXUS-6863: To not spit full stack trace

As the exception is again logged by Content servlet
Merge branch 'nexus-2.10.x' into nexus-2.10.x-NEXUS-6863-registry-eof
Fixing the IT

As now the error bubbles up to client and it made IT
to fail, as mock registry has the data in wrong location
Merge pull request #9 from sonatype/nexus-2.10.x-NEXUS-6863-registry-eof

NEXUS-6863: Make regRoot fetch related failure propagate to the client