Description of problem: 
`pcs cluster auth nodeA nodeB` doesn't work in RHEL 8. When trying to authenticate nodes during cluster creation it fails with following error:

Usage: pcs cluster auth...
    auth [-u <username>] [-p <password>]
        Authenticate pcs/pcsd to pcsd on nodes configured in the local cluster.

Version-Release number of selected component (if applicable): pcs --version: 0.10.2

How reproducible: Easy

Steps to Reproduce:

1. Set up the authentication needed for pcs.
	# pcs cluster auth node1 node2 -u hacluster -p *****

2. Setup authentication for pcs using --force
		# pcs cluster auth node1 node2 -u hacluster -p ***** --force

Actual results:

Usage: pcs cluster auth...
    auth [-u <username>] [-p <password>]
        Authenticate pcs/pcsd to pcsd on nodes configured in the local cluster.


Expected results:

The syntax to authenticate cluster nodes has changed in RHEL 8:

Usage: pcs host auth (<host name> [addr=<address>[:<port>]])... [-u <username>]
            [-p <password>]
        Authenticate local pcs/pcsd against pcsd on specified hosts. It is
        possible to specify an address and a port via which pcs/pcsd will
        communicate with each host. If an address is not specified a host name
        will be used. If a port is not specified 2224 will be used.

Additional info: 
There are syntactic changes between RHEL7 and RHEL8. Please refer to our Red Hat documentation for further details. https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/configuring_and_managing_high_availability_clusters/