[master] Stop using XM0LRPC for getting list of application platforms
The XMLRPC endpoint is no longer being updated for new releases so we should stop using it.
cc @bcouturi
See also: LHCbWebDIRAC!87 (merged)
BEGINRELEASENOTES
*Configuration CHANGE: Use CVMFS cache instead of XMLRPC for getting list of project platforms
ENDRELEASENOTES