WORKAROUND: cleanup the resources
Stop monitoring postgresql through the IP address and with a password

The password is not correct the first time, which can result in some
issues.
Use inf for score, not INFINITY

The result is the same for crm, but our pacemaker cookbook cannot
properly compare the values when using INFINITY.
Update for new crowbar_pacemaker_drbd LWRP
Remove unneeded cleanup
Improve constraints naming
Add ability to choose size of DRBD device

Since it's a LVM volume, we can't guess what's right and it's better to
leave it up to the user.
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