Implement email task.
Implement email task.

Email.py was added so that the emailto attribute could be passed,
and to prevent 'module object has no attribute: email' errors from
happening.  Run.py actual performs the email operation and calls
suite.email_results to do the actual send mail operation.  The
information passed right now is the summary and config information.

Signed-off-by: Warren Usui <021fe6d8989d7bdb08c8700d8c426ea80a140097@inktank.com>

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