sdn: fix network-already-set-up detection

Due to a misguided attempt to harmonize addresses and routes
checking in alreadySetUp().  Turns out addresses can simply be
checked for equality since they are returned from GetAddresses()
as plain CIDRs, but routes need the extra " " in the check because
the entire '/sbin/ip route' line is returned.

Fixes: #11082
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1388856

pkg/sdn/plugin/controller.go

@@ -90,7 +90,7 @@ func (plugin *OsdnNode) alreadySetUp(localSubnetGatewayCIDR, clusterNetworkCIDR
 	}
 	found = false
 	for _, addr := range addrs {
-		if strings.Contains(addr, localSubnetGatewayCIDR+" ") {
+		if strings.Contains(addr, localSubnetGatewayCIDR) {
 			found = true
 			break
 		}