config: remove any spaces in public_network or cluster_network

config: remove any spaces in public_network or cluster_network

With two public networks configured - we found that with
"NETWORK_ADDR_1, NETWORK_ADDR_2" install process consistently became
broken, trying to find docker registry on second network, and not
finding mon container.

but without spaces
"NETWORK_ADDR_1,NETWORK_ADDR_2" install succeeds
so, containerized install is more peculiar with formatting of this line

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1534003
Signed-off-by: Sébastien Han <seb@redhat.com>