added DefineCircuitType() method

Extract circuit type metadata  creation in DefineModuleType() to a new
method DefineCircuitType()  to allow null image name, and different base
types other than Schema.moduleType.Type
https://github.com/SonyWWS/ATF/issues/19Extract circuit type metadata
creation in DefineModuleType() to a new method DefineCircuitType()  to
allow null image name, and different base types other than
Schema.moduleType.Type #19