Improve behavior of ConfigurationMock class and export it in "tests" jar to allow usage by other modules * Handle property methods with booleans * Default to mockito behavior (default values) for non-property methods or property methods with no default value in configuration * Add more unit tests to ConfigurationMockTest class

Minor changes: * rename remaining "admin" to "config" * move all config related files under "config" source and output folders * use META-INF/services for config manifest file allowing us to use ServiceLoader in future * fixed redundant imports from earlier commit.

Reorganize opendj-config packaging, removing all references to opends and renaming admin to config

OPENDJ-1235: Migrate configuration framework * rename opendj-admin to opendj-config