Do not reboot after packstack install for juno

* neutron fails to connect to mysql post reboot in juno. Consider this a
* work around for the issue.
* testing w/ fedora20 juno and all other icehouse combinations
* testing passes, juno installs get further now, current failure is uploading a
* cirros image and is unrelated

* ready for review

Change-Id: Ib6143dcd35b529ea0f105d741cede2b4546101db