Add OpenStack Client for Manila docs

This commit includes documentation about OSC
implementation for Manila.

bp openstack-client-support

Change-Id: Ic91a81e16e506103c08ef42ed0f8634a2b70e1dd

Author: mrtmm

doc/requirements.txt

@@ -20,6 +20,7 @@ python-heatclient>=1.10.0 # Apache-2.0
 python-ironicclient>=2.3.0 # Apache-2.0
 python-ironic-inspector-client>=1.5.0 # Apache-2.0
 python-karborclient>=0.6.0 # Apache-2.0
+python-manilaclient>=2.0.0 # Apache-2.0
 python-mistralclient!=3.2.0,>=3.1.0 # Apache-2.0
 python-muranoclient>=0.8.2 # Apache-2.0
 python-neutronclient>=6.7.0 # Apache-2.0

doc/source/cli/plugin-commands/index.rst

@@ -16,6 +16,7 @@ Plugin Commands
    ironic
    ironic-inspector
    karbor
+   manila
    mistral
    neutron
    octavia

doc/source/cli/plugin-commands/manila.rst

@@ -0,0 +1,4 @@
+manila
+------
+
+.. autoprogram-cliff:: openstack.share.v2