Add 'sa' privileges to slice credential to get renewsliver.
Add 'sa' privileges to slice credential to get renewsliver.

renewsliver should really be in 'control', but that is an upstream
change, so this is a workaround.

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