mgmt console: describe SYSLOG_ENABLED option

bug 1112838
https://bugzilla.redhat.com/show_bug.cgi?id=1112838

console.conf should include a description of the (commented-out) option
SYSLOG_ENABLED that's mentioned in the admin guide.
Merge pull request #5547 from sosiouxme/bz1112838

Merged by openshift-bot