Detect multi-region test cases
Detect multi-region test cases

Enable multi-region calls and tests only if
the configuration has specified a
radosgw-agent tastk.

Signed-off-by: Joe Buck <a95e51950b61b017a762bcc8a962bac0b1a073a0@gmail.com>
Reviewed-by: Josh Durgin <51652c783f70f5b272ebd02f1fd20d3af7a2449f@inktank.com>

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