* Add unittests to cover uncovered code in MemoryManager ADEF_ and REF_ parsers.
* Remove the second production of the 'user_defined_type' target
because it is superfluous, and impossible to reach. This is
because the NAME token is defined as pattern : '[_a-zA-Z][_a-zA-Z0-9:]*'.
This pattern will always match a string of colon separated names.
Note that the NAME itoken is used for colon separated type-name as well as
colon separated variable names.
* Add a test to MM_declare_var_unittest that covers the HEX token in adef_parser.l.
* Add a unittest for MemoryManager_JSON_Intf.cpp.
* Tweak MM_JSON_Intf.cc to get better code-coverage.
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