Specify omnispec in api_test.py.
Specify omnispec in api_test.py.

Fix a failing createsliver test by updating api_test to explicitly
specify --omnispec now that the default is native rspecs.

plantigrade/geni-tools,GENI-NSF/gram,tcmitchell/geni-tools,ahelsing/geni-tools,GENI-NSF/gram,GENI-NSF/gram,tcmitchell/geni-tools,plantigrade/geni-tools,ahelsing/geni-tools