Fix rpm version logic for hosts

Currently, the variable openshift_pkg_version is defined
by the first master unless specified by the user.  The role
openshift_version attempts to set this value on all other
hosts after setting it on the first master.

During normal installation, openshift_pkg_version is not
initially defined, therefor each host will utilize the
most recent rpm available.  This creates a problem
during later operations of a cluster if a node is added
or replaced by a new node.

This commit ensures that the value for openshift_pkg_version
set by the first master is respected by subsequent hosts.

Fixes: #5341

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