CLI : GLobal option for NFS-Ganesha

A new global CLI option has been introduced for NFS-Ganesha.
gluster features.ganesha enable/disable.
This option is persistent and shall be inherited
by new volumes created after this option is set.

gluster features.ganesha enable

It carries out the following functions:
1. Disables gluster-nfs across the cluster
2. Starts NFS-Ganesha server on a subset of nodes and exports  '/'.
3. Creates the HA cluster for NFS-Ganesha.
4. Writes the option into the global config file.

gluster features.ganesha disable

1. Stops NFS-Ganesha server.
2. Tears down the HA cluster for NFS-Ganesha

With this change the older volume set
options with keys "nfs-ganesha.host"
and "nfs-ganesha.enable" will no longer
be supported. This commit has only has the
CLI related changes. Another patch will
be submitted to support this feature entirely.

Change-Id: Ie4b66a16c23b33b795738654b9a68f8e2c34efe3
BUG: 1188184
Signed-off-by: Meghana Madhusudhan <mmadhusu@redhat.com>
Reviewed-on: http://review.gluster.org/9538
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>

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