inventory: Denote new required upgrade variables

inventory/byo/hosts.origin.example

@@ -613,6 +613,7 @@ openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true',
 # WORKAROUND : If you must use an overlapping subnet, you can configure a non conflicting
 # docker0 CIDR range by adding '--bip=192.168.2.1/24' to DOCKER_NETWORK_OPTIONS
 # environment variable located in /etc/sysconfig/docker-network.
+# When upgrading these must be specificed!
 #osm_cluster_network_cidr=10.128.0.0/14
 #openshift_portal_net=172.30.0.0/16
 
@@ -634,6 +635,7 @@ openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true',
 
 # Configure number of bits to allocate to each host’s subnet e.g. 9
 # would mean a /23 network on the host.
+# When upgrading this must be specificed!
 #osm_host_subnet_length=9
 
 # Configure master API and console ports.

inventory/byo/hosts.ose.example

@@ -621,6 +621,7 @@ openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true',
 # WORKAROUND : If you must use an overlapping subnet, you can configure a non conflicting
 # docker0 CIDR range by adding '--bip=192.168.2.1/24' to DOCKER_NETWORK_OPTIONS
 # environment variable located in /etc/sysconfig/docker-network.
+# When upgrading these must be specificed!
 #osm_cluster_network_cidr=10.128.0.0/14
 #openshift_portal_net=172.30.0.0/16
 
@@ -642,6 +643,7 @@ openshift_master_identity_providers=[{'name': 'htpasswd_auth', 'login': 'true',
 
 # Configure number of bits to allocate to each host’s subnet e.g. 9
 # would mean a /23 network on the host.
+# When upgrading this must be specificed!
 #osm_host_subnet_length=9
 
 # Configure master API and console ports.