rgw: create clients in all zones when regions are used
rgw: create clients in all zones when regions are used

Signed-off-by: Josh Durgin <51652c783f70f5b272ebd02f1fd20d3af7a2449f@inktank.com>

SUSE/teuthology,michaelsevilla/teuthology,robbat2/teuthology,ktdreyer/teuthology,caibo2014/teuthology,michaelsevilla/teuthology,SUSE/teuthology,yghannam/teuthology,t-miyamae/teuthology,dmick/teuthology,tchaikov/teuthology,dmick/teuthology,dmick/teuthology,SUSE/teuthology,t-miyamae/teuthology,robbat2/teuthology,ivotron/teuthology,zhouyuan/teuthology,ivotron/teuthology,ceph/teuthology,tchaikov/teuthology,ktdreyer/teuthology,zhouyuan/teuthology,caibo2014/teuthology,yghannam/teuthology,ceph/teuthology,dreamhost/teuthology,dreamhost/teuthology