refactor (ProxyDB): take reminder mail source address from instance attribute instead of config (!1140) · Merge requests · LHCb Dirac / LHCbDIRAC

To follow on https://github.com/DIRACGrid/DIRAC/pull/5636 Need first a release of DIRAC with this PR merged

BEGINRELEASENOTES *Framework

CHANGE: take proxy expiry notification email sender address from the service configuration

ENDRELEASENOTES

refactor (ProxyDB): take reminder mail source address from instance attribute instead of config