Replace validation code with annotations

Replace validation code with annotations

Instead of having code to validate various values, created POJOs to
represent the decoded data so that bean validation annotations could be
used instead.
Didn't see any obvious ways to use annotations in the Optimization code,
but did notice a bug (passed role instead of provisions).  Extracted a
common method which fixed the bug as a side-effect.

Issue-ID: POLICY-2418
Change-Id: I9ef589086fc8f7f66810b66405fbf302d7570e5a
Signed-off-by: Jim Hahn <jrh3@att.com>