Fix broken schema

This got broken during a rebase :/
Merge pull request #61 from vuntz/schema-fix

Fix broken schema
Include drbd::default recipe from crowbar-pacemaker

We need to install the drbd bits before they can be used.

Also, since the master information will be per-resource, stop defining
it.
Merge pull request #45 from mjura/release/roxy/drbd

Fixes for drbd cookbook
Merge pull request #62 from vuntz/drbd-fixes

Include drbd::default recipe from crowbar-pacemaker
drbd: Use variable for long drbd-overview command used several times
drbd: rework "wait for drbd" loop to avoid unneeded sleep
drbd: Add a DrbdOverview.get helper

This parses the output of drbd-overview so we can do things based on
this.
drbd: always run "drbdadm create-md" if the resource is unconfigured

We were relying on a notification from the template, but that's actually
wrong: there's nothing in the template that really matters there, I
think (except the disk, but if it changes, then we have other issues);
drbd: always run "drbdadm primary" if there's no primary role

There's no need for a notification: we have the information of whether
the role is missing or not.