heat tests : remove unused get_sftp_client()
heat tests : remove unused get_sftp_client()

get_sftp_client is not needed so remove it

Change-Id: I9fb0670730e808c1f2786866ad3451f8e9f38789
Signed-off-by: Steven Hardy <4d1810d1ff6d7f22d774341c4549c02173d2f2ab@redhat.com>

ntt-sic/heat,Triv90/Heat,takeshineshiro/heat,JioCloud/heat,dragorosson/heat,dims/heat,jasondunsmore/heat,openstack/heat,srznew/heat,openstack/heat,citrix-openstack-build/heat,gonzolino/heat,Triv90/Heat,maestro-hybrid-cloud/heat,rh-s/heat,pshchelo/heat,jasondunsmore/heat,cwolferh/heat-scratch,varunarya10/heat,redhat-openstack/heat,rickerc/heat_audit,dragorosson/heat,JioCloud/heat,cryptickp/heat,pratikmallya/heat,steveb/heat,varunarya10/heat,pshchelo/heat,pratikmallya/heat,miguelgrinberg/heat,Triv90/Heat,miguelgrinberg/heat,noironetworks/heat,dims/heat,ntt-sic/heat,srznew/heat,NeCTAR-RC/heat,rh-s/heat,NeCTAR-RC/heat,citrix-openstack-build/heat,rdo-management/heat,takeshineshiro/heat,redhat-openstack/heat,cwolferh/heat-scratch,maestro-hybrid-cloud/heat,rdo-management/heat,rickerc/heat_audit,noironetworks/heat,steveb/heat,cryptickp/heat,gonzolino/heat