Cherry pick keepalived SELinux fixes

1. Allow keepalived to read /proc for insmod and iptables
2. Correct file context for /mnt/state/var/log/keepalived
Increase disk size for m1.tiny to 10G

This is so that we can use the rhel-guest-image as user image if
we want to, cause it won't fit in 2G.
Perform storage tests also if no external storage nodes are deployed
Switch demo flavor from m1.tiny to m1.demo
Adding deployment of Overcloud using tuskar

Adding tuskar deployment as alternative in
instack-deploy-overcloud script.
Create bigger flavor in tests too

Without this flavor, the tests fail. When we deploy and post
configure the stack using UI and we want to run tests, we need
that code here.
Merge pull request #59 from rwsu/selinux-picks

Cherry pick keepalived SELinux fixes
Merge pull request #61 from gfidente/rhel_guest_image

Increase disk size for m1.tiny to 10G
Merge pull request #47 from Ladas/master

Adding deployment of Overcloud using tuskar
Merge pull request #62 from gfidente/storage_tests

Perform storage tests also if no external storage nodes are deployed
Merge pull request #63 from gfidente/master

Fixes #55. Cherry pick change for tripleo-image-elements
Don't uninstall rdo-release
Rename delorean json file to just packages
Delorean is no longer the default, and add a new variable to control installing from packages or not, $PACKAGES
Add element to setup rdo juno stage repo
Add script to setup delorean
Update install scripts and build images to use RDO juno stage repo by default
Remove some unneeded workarounds
only attempt install if these packages aren't already installed
Install rdo-release to setup the stage repo for juno if not already installed.