Move Sahara into in-tree plugin

Once the Sahara related code moved to Sahara repo and used, we can
remove Sahara specific code from Devstack.

Partial-Implements: bp sahara-devstack-intree

Change-Id: I34412b5cb2e86944b8555b8fd04b43556eb2bbe6
Depends-on: I2e00b2ebc59dd3be6a0539dea2985f2e801a1bd7
Depends-on: I07c3fede473030e8a110cbf5a08309f890905abf
diff --git a/doc/source/index.rst b/doc/source/index.rst
index f15c306..2dd0241 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -170,7 +170,6 @@
 * `lib/nova <lib/nova.html>`__
 * `lib/oslo <lib/oslo.html>`__
 * `lib/rpc\_backend <lib/rpc_backend.html>`__
-* `lib/sahara <lib/sahara.html>`__
 * `lib/swift <lib/swift.html>`__
 * `lib/tempest <lib/tempest.html>`__
 * `lib/tls <lib/tls.html>`__
@@ -181,7 +180,6 @@
 
 * `extras.d/50-ironic.sh <extras.d/50-ironic.sh.html>`__
 * `extras.d/60-ceph.sh <extras.d/60-ceph.sh.html>`__
-* `extras.d/70-sahara.sh <extras.d/70-sahara.sh.html>`__
 * `extras.d/70-tuskar.sh <extras.d/70-tuskar.sh.html>`__
 * `extras.d/70-zaqar.sh <extras.d/70-zaqar.sh.html>`__
 * `extras.d/80-tempest.sh <extras.d/80-tempest.sh.html>`__
@@ -238,7 +236,6 @@
 * `exercises/floating\_ips.sh <exercises/floating_ips.sh.html>`__
 * `exercises/horizon.sh <exercises/horizon.sh.html>`__
 * `exercises/neutron-adv-test.sh <exercises/neutron-adv-test.sh.html>`__
-* `exercises/sahara.sh <exercises/sahara.sh.html>`__
 * `exercises/sec\_groups.sh <exercises/sec_groups.sh.html>`__
 * `exercises/swift.sh <exercises/swift.sh.html>`__
 * `exercises/volumes.sh <exercises/volumes.sh.html>`__
diff --git a/doc/source/plugin-registry.rst b/doc/source/plugin-registry.rst
index 2dd70d8..c5c4e1e 100644
--- a/doc/source/plugin-registry.rst
+++ b/doc/source/plugin-registry.rst
@@ -22,6 +22,8 @@
 +--------------------+-------------------------------------------+--------------------+
 |magnum              |git://git.openstack.org/openstack/magnum   |                    |
 +--------------------+-------------------------------------------+--------------------+
+|sahara              |git://git.openstack.org/openstack/sahara   |                    |
++--------------------+-------------------------------------------+--------------------+
 |trove               |git://git.openstack.org/openstack/trove    |                    |
 +--------------------+-------------------------------------------+--------------------+
 |zaqar               |git://git.openstack.org/openstack/zarar    |                    |