4540: Enable proper accounting for vanilla proxies

A cut and paste bug meant that we weren't always counting
jobs with vanilla grid proxies correctly. This corner case
occurs only when GLIDIEN_REQUIRE_GLEXEC_USE = True.
4540: Fix mislabelled log line in frontend, add vanilla idle jobs

The "Jobs found" line in the frontend log had the number of old
idle jobs and number of voms jobs reversed in the message.  We
also add to the logline in the number of ProxyIdle jobs that are counted
(as "grid")