Use selenium_xvfb_args in selenium.unit file

Author: Jerker Montelius

templates/selenium-unit.j2

@@ -3,7 +3,7 @@ Description=selenium test framework
 After=syslog.target network.target
 
 [Service]
-ExecStart=/usr/bin/xvfb-run /usr/bin/java -client -jar {{ selenium_install_dir }}/selenium/selenium-server-standalone-{{ selenium_version }}.jar
+ExecStart=/usr/bin/xvfb-run {{ selenium_xvfb_args }} /usr/bin/java -client -jar {{ selenium_install_dir }}/selenium/selenium-server-standalone-{{ selenium_version }}.jar
 Restart=on-failure
 RestartSec=20s