rgw: access key uses url safe chars
rgw: access key uses url safe chars

Signed-off-by: Yehuda Sadeh <c1eb8c005751bb994f710dd972d6ff9cd6fce252@dreamhost.com>

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