Remove static state and default beans from RuntimeMappingModuleFactory,SchemaServiceI...

Remove static state and default beans from RuntimeMappingModuleFactory,SchemaServiceImplSingletonModuleFactory.

Remove static reference from factories as this breaks tests: it is useful to tear down config subsystem
between tests, but there is no way to clean up static fields.
Since default beans are discouraged, rework those factories to enforce instance naming so that only a single
instance can be created.
01-md-sal.xml already creates both modules.

Change-Id: I5efbe12b349ae82bfff12ae9a767505a66df2f90
Signed-off-by: Tomas Olvecky <tolvecky@cisco.com>