Install xfsprogs if we're using xfs for a DRBD device
sbd: Wait for cluster to be up after corosync restart

Every time we start corosync, we need to wait for the cluster to be up.
And when we use sbd, we restart corosync to start sbd, so we need to
wait there too.
Merge pull request #101 from vuntz/install-xfs

Install xfsprogs if we're using xfs for a DRBD device
Fix installation of xfsprogs
Merge pull request #102 from vuntz/sbd-sync

sbd: Wait for cluster to be up after corosync restart
Merge pull request #103 from vuntz/install-xfs-fix

Fix installation of xfsprogs
Merge branch 'release/roxy/master' into merge-roxy
Merge pull request #112 from vuntz/merge-roxy

Merge roxy branch into stoney