CPS-505 Retrieving modules for new CM handle

CPS-505 Retrieving modules for new CM handle

-Added some production code for getting missing modules for new CM
handle
-Groovy test template added by Toine for getting msissing modules
-Added json example for test
-Modified test to check map contents
-Differentiated restTemplate calls based on URL
-Fixed code review comment`s
-Groovy test now passing
-Modified behaviour for sending moduleReferences and added null to
namespace (jira to follow)
-Combined NetworkCmProxyDataServiceImpl tests into one class & addressed
code review comments

Issue-ID: CPS-505

Change-Id: I91ef65467496caea7834ba2e8af99cfe58d4f880
Signed-off-by: JosephKeenan <joseph.keenan@est.tech>