Make all the parameters of netplugin & netmaster configurable through the ansible scripts

[neelimamukiri]

Currently there are many options to netplugin & netmaster.
See
https://github.com/contiv/netplugin/blob/master/netplugin/netd.go
https://github.com/contiv/netplugin/blob/master/netmaster/main.go

We need a way to specify them using the ansible role.
Some args are already being provided https://github.com/contiv/ansible/blob/master/roles/contiv_network/templates/netmaster.j2 and https://github.com/contiv/ansible/blob/master/roles/contiv_network/templates/netplugin.j2

We need to either add the others or have a generic parameter list string as an option.

To provide context, I need this as I am trying to run netmaster & etcd on a subset of the nodes and netplugin uses localhost: 2379 for the default cluster. Currently there is no arg for cluster_store in the ansible.

[neelimamukiri]

Cluster store field was added in 1d7d2d7.
So netplugin does not need any additional parameter.
TODO: add listen-url (:9999) and dns-enable (false) parameters to the netmaster installation. I will add these.

[rchirakk]

@neelimamukiri, dns-enable (false) will be removed by contiv/netplugin#661

[neelimamukiri]

Thanks @rchirakk. So netmaster port is the only parameter left to be added.

[rhim]

Since #331 isn't slated for beta, I am removing this issue from beta milestone.