tools: Sync engine-config man pages and help

Synchronizes content of engine-config man page with information
displayed by execution 'engine-config -h'.

Change-Id: I16e16973cb24e7e6e3209d229e0cdabfd3ffbc84
Bug-Url: https://bugzilla.redhat.com/1074299
Signed-off-by: Martin Perina <mperina@redhat.com>