[maven-release-plugin] prepare release 1.5.1
ACCUMULO-2281 copy dependencies to correct dir

Use project.parent.basedir instead of relative paths for copying
dependencies for packaging and assembly.
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT (-sours)
ACCUMULO-2170 updating snapshot to 1.5.2-SNAPSHOT
Merge tag '1.5.1' into 1.5.2-SNAPSHOT

Signing 1.5.1 release
Merge branch 1.5.2-SNAPSHOT into 1.6.0-SNAPSHOT
ACCUMULO-2399 Alert user CI table should exist

Extract common table checking functionality for continuous clients and
fail fast when the table does not exist. No longer create the table in
ingest to make the requirement explicit.
Merge branch '1.4.5-SNAPSHOT' into 1.5.2-SNAPSHOT
Merge branch '1.5.2-SNAPSHOT' into 1.6.0-SNAPSHOT
Merge branch '1.6.0-SNAPSHOT'