splitting into roles
Merge Matts CentOs QEMU fixes

https://bugzilla.redhat.com/show_bug.cgi?id=1039024
Fixing problems with role split
set tags only in bootstrap.yml, remove unused roles
Don't fail if qemu-kvm package couldn't be removed
use yum module to install qemu-kvm
remove eroneous newline
install both the qemu-kvm packages
install img package first
delegate create osd_devices attribute
disable package_upgrades
override cinder_volume_packages to not include qemu-img
ensure OSD attributes are correctly set
create osd dir if not using raw device
Fix wait for solr cache in osd deploy
cinder package override attempt 2
cinder package override attempt 3
override cinder packages with distro specific list
use yum/apt for rhel/debian
install packages before attempting to deploy OS