handler: updated fix to reboot

Change-Id: I6608bb07a6e0455777659f720ffa777d1e5dfd4f
khaleesi reboot: created default options for reboot

works w/ f20
works w/ rhel6.5
rhel7 requires override, reboot_options: " --no-wall"

Change-Id: Iba5fb08b4f9e4a6e4b8572108163df6c8d7e5e29