doc: neutron agents node also need to be labelled with openvswitch

[Ananth-vr]

Is this a bug report or feature request? (choose one):
bug

Kubernetes Version (output of kubectl version):
Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.2", GitCommit:"08e099554f3c31f6e6f07b448ab3ed78d0520507", GitTreeState:"clean", BuildDate:"2017-01-12T04:57:25Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.4", GitCommit:"7243c69eb523aa4377bce883e7c0dd76b84709a1", GitTreeState:"clean", BuildDate:"2017-03-07T23:34:32Z", GoVersion:"go1.7.4", Compiler:"gc", Platform:"linux/amd64"}

Helm Client and Tiller Versions (output of helm version):
helm version
Client: &version.Version{SemVer:"v2.2.2", GitCommit:"1b330722aafcb8123114ae51f69d1e884a326f3e", GitTreeState:"clean"}

Server: &version.Version{SemVer:"v2.2.2", GitCommit:"1b330722aafcb8123114ae51f69d1e884a326f3e", GitTreeState:"clean"}
Development or Deployment Environment?:
deployment
Release Tag or Master:

Expected Behavior:
neutron agents should not complain about missing integration bridge ie br-int
What Actually Happened:
neutron agents logs are showing missing bridge br-int and tap interfaces of q* network namespaces are not getting connected.
How to Reproduce the Issue (as minimally as possible):

Any Additional Comments:
adding openvswith label to nodes fixed above error