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Description of problem:

This bug opened for BZ 1593459 backport purpose.

Right now, there is no way to easily tell multipath that you want to blacklist or whitelist devices based on what protocol and transport method that they are using. You can't easily (for instance) blacklist all devices except scsi devices using Fibre Channel or iSCSI. To solve this multipath needs a new blacklist/blacklist_exceptions type, "protocol". This will allow you to do things like

blacklist {
        protocol ".*"
}

blacklist_exceptions {
        protocol "(scsi:fcp|scsi:iscsi)"

This change is largely self-contained, and I'm fine with backporting it.

1593459 is the RHEL-7.6 bug. This one is supposed to be a zstream bug. I don't actually know the process to go through to create a zstream bug. So, if requesting the rhel-7.5.z flag, and adding the ZStream flag isn't right way to go about this (I'm pretty sure that PM is supposed to be the ones setting up zstream bugs, so I assume that there is more to it that just this) then I'd like to request a zstream bug. RHEV can provide the business justification, if necessary.