Tests must specify serialization provider

When GSON is made the default serialization provider, several
junits break.  Modified them to specify the GsonJackson provider,
which is what the REST classes use in production.

Issue-ID: POLICY-1526
Change-Id: If1bcb955d7411cf747a14a0bf1dc069b02e2f2ea
Signed-off-by: Jim Hahn <jrh3@att.com>
2 files changed