Added unique constraint for external id identifier for disambiguated org #499

Job	Run time
unit_tests_artifact / tst_iapi / maven_test	2m 36s
unit_tests_artifact / tst_ml / maven_test	2m 51s
unit_tests_artifact / tst_api / maven_test	4m 18s
unit_tests_artifact / tst_amq / maven_test	2m 38s
unit_tests_artifact / tst_core / maven_test	6m 35s
unit_tests_artifact / tst_persistence / maven_test	3m 42s
unit_tests_artifact / tst_sched / maven_test	2m 46s
unit_tests_artifact / tst_pubweb / maven_test	3m 44s
unit_tests_artifact / tst_utils / maven_test	4m 19s
unit_tests_artifact / tst_web / maven_test	3m 32s
unit_tests_artifact / tst_api_common / maven_test	2m 55s
	39m 56s

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