Description of problem:

Wildfly won't start due to a typo in systemd service file. See proposed patch.

Version-Release number of selected component (if applicable):
8.0.0-0.6.Alpha3

How reproducible:
always

Steps to Reproduce:
1. systemctl start wildfly.service
2. sleep 5 # needed, it's java:)
3. systemctl status wildfly.service

Actual results:
from server.log:
06:51:50,131 ERROR [stderr] (main) JBAS015800: Value expected for option -b

Expected results:
running wildfly

Additional info:
Tested on F20, but Rawhide is probably affected as well.