treewide: rename node.NodeManagement to node.NodeManagementPort

This is the only constant not having Port in its name which breaks the
naming scheme. Lets clean this up by adding it.

Change-Id: Ic34c81c6d80c69e20516f4fca3c26560bbcf3ac6
Reviewed-on: https://review.monogon.dev/c/monogon/+/2911
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/cli/metroctl/core/rpc.go b/metropolis/cli/metroctl/core/rpc.go
index 1c4fa4f..b469544 100644
--- a/metropolis/cli/metroctl/core/rpc.go
+++ b/metropolis/cli/metroctl/core/rpc.go
@@ -75,7 +75,7 @@
 	creds := rpc.NewAuthenticatedCredentials(tlsc, rpc.WantRemoteCluster(ca), rpc.WantRemoteNode(nodeId))
 	dialOpts = append(dialOpts, grpc.WithTransportCredentials(creds))
 
-	endpoint := net.JoinHostPort(nodeAddr, node.NodeManagement.PortString())
+	endpoint := net.JoinHostPort(nodeAddr, node.NodeManagementPort.PortString())
 	return grpc.Dial(endpoint, dialOpts...)
 }