GlideinWMS

I was able to install the 3.9.1.rc4 rpms, and successfully run a smoke test - jobs submitted on frontend triggered glideins on my factory, which then ran my jobs.

I have found the following issues so far:

• the frontend user seems not to be created by the rpms, leading to lots of errors during install of glideinwms-vofrontend-core like so:

warning: user frontend does not exist - using root
warning: user frontend does not exist - using root
warning: user frontend does not exist - using root

after the install, the frontend fails to reconfig as frontend.xml and lots of other files are owned by root.

• glideinFrontendElement.py fails to write newly created idtokens to a file after creating them, see my proposed fix in this branch. The fix is tested and works, I am unsure if it is the best solution, it has to do with string representation differences between python2/3.

• once the above problem is fixed, glideFactoryEntry.py fails to write the decrypted tokens to their proper files on the factory side. Again, a proposed fix is in this branch.