mpath: Don't allow more than one mpath pool at a time
https://bugzilla.redhat.com/show_bug.cgi?id=1232606 Since an mpath pool contains all the Multipath devices on a host, allowing more than one defined on a host at a time should be disallowed under the policy of disallowing duplicate source pools for the host. Adjust to docs to clarify the Multipath target path value usage for both the storage driver (only 1 pool per host) and formatstorage references (ignore the target element in favor of the default target mapping of /dev/mapper).
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