add requestor if not specified
0.9.52

Signed-off-by: Stephen Foulkes <sfoulkes@fnal.gov>
Merge pull request #4514 from ticoann/reqmgr_requestor

add requestor according to cert user if not specified
0.9.53

Signed-off-by: Zdenek Maxa <zdenek.maxa@cern.ch>