HG1303 ReqMgr

It includes fixes for all ReqMgr related issues included in the milestone, there are 4 commits for easy review.

I need review from @zdenekmaxa and @sfoulkes for this one please. There is also a minor commit for the workload summary.

I have tested all of these already in my deployment (https://cmsoguatworld.cern.ch/reqmgr). If you want to try anything, all is deployed there and you have permissions to submit requests or run the all-tests.