Config fixes for Ubuntu 14.04

Apache now expects sites-[available|enabled] to end in .conf, so update dev creation to create 000-default.conf instead of [000-]default.

Gearman no longer creates a PID file that can be checked for. Instead, check the status directly by asking gearadmin for the PID.

refs #7293
Check `$?` rather than length of string, maybe?