task/restart:  Cleanup in finally
task/restart:  Cleanup in finally

Need to cleanup the files created for this test from
the testdir.

Signed-off-by: Sam Lang <70ab3b98ad075c66e7d3501cb42b80a7e41da316@inktank.com>

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