Description of problem:  First appearance of this feature is here:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=224462

A user was attempting to use the same mountpoint for two different file systems
as part of two independent services which would never coexist due to restricted
failover domain configurations.

Actual results: Illegal configuration.

Expected results: Not fully explored.

This might not be possible since rgmanager was designed to allow coexistence of
all resources on a single node for a given configuration - even if the requisit
device(s) were not present for all nodes.

Since placement of resources is separate from resource definitions, this is
difficult to solve using failover domains.  However, it may be possible to solve
this at least partially using the inter-service dependencies which are being
explored:  If two services have 'colocate' set to 'never', it may be permissable
to allow collisions of "unique" attributes between those services' private
resources.

[Note: Primary attributes will *not* be allowed to collide, their resource
placement policies notwithstanding.]

This is a feature request.