(for PilotLogging) find the VO from the proxy, and from the token

[fstagni]

Follow-up of DIRACGrid/DIRAC#6208 (comment)

an easy way to get the VO from a proxy would be using voms-proxy-info, e.g.
$ voms-proxy-info -file /tmp/x509up_u49429 -vo
lhcb
but this of course relies on voms-proxy-info being on the WN before DIRAC is installed, or using a cvmfs-deployed version, like the one in dirac.egi.eu/client/diracos/. This would be OK most probably for several LCG resources but not necessarily for all resources (and on HPCs we might be in trouble). Base openssl is not enough.
We can of course rely on "sensible defaults" if we fail to get the VO from the proxy (and ~soon from the token).

Verify if it is possible to do it with basic openssl.

[fstagni]

Close as duplicate of DIRACGrid/DIRAC#6491