Allow to pass cinderv3 internal params

This patch allows to pass number of retries to cinderv3 module
via connection_params.

cinder:
  controller:
    client:
      connection_params:
        connect_retries: 2
        connect_retry_delay: 10
  client:
    connection_params:
      connect_retries: 2
      connect_retry_delay: 10

 * Remove dead code from cinder.client
 * Increase default retries to 60sec

Change-Id: I27aa89d95ac82b12fcb919f74e09877fb01e96de
Related-Prod: PROD-25982
diff --git a/README.rst b/README.rst
index b90b39a..ed605ca 100644
--- a/README.rst
+++ b/README.rst
@@ -51,6 +51,10 @@
           user: openstack
           password: pwd
           virtual_host: '/openstack'
+       client:
+         connection_params:
+           connect_retries: 50
+           connect_retry_delay: 1
         backend:
           7k2_SAS:
             engine: storwize
@@ -693,6 +697,9 @@
           protocol: http
           endpoint_type: internalURL
           region_name: RegionOne
+        connection_params:
+          connect_retries: 5
+          connect_retry_delay: 1
         backend:
           ceph:
             type_name: standard-iops