Remove swiftclient dependency

Removes the requirement for swiftclient in swift-dispersion-report
and swift-dispersion-populate. To prevent a dependency on
keystoneclient and to avoid reinventing the wheel with an internal
keystoneclient, authentication with keystone is only supported if
swiftclient is available. If not, only auth v1 is supported.

The dependency in swift/container/sync.py has also been removed.

Implements: blueprint remove-swiftclient-dependency

Change-Id: I6ec3b3c85a67b9ab6eb04b90ffc16daf1600e8a7

bin/swift-dispersion-populate

@@ -24,7 +24,11 @@ from time import time
 from eventlet import GreenPool, patcher, sleep
 from eventlet.pools import Pool
 
-from swiftclient import Connection, get_auth
+try:
+    from swiftclient import get_auth
+except ImportError:
+    from swift.common.internal_client import get_auth
+from swift.common.internal_client import SimpleClient
 from swift.common.ring import Ring
 from swift.common.utils import compute_eta, get_time_units, config_true_value
 
@@ -133,12 +137,8 @@ Usage: %%prog [options] [conf_file]
                           insecure=insecure)
     account = url.rsplit('/', 1)[1]
     connpool = Pool(max_size=concurrency)
-    connpool.create = lambda: Connection(conf['auth_url'],
-                                         conf['auth_user'], conf['auth_key'],
-                                         retries=retries,
-                                         preauthurl=url, preauthtoken=token,
-                                         os_options=os_options,
-                                         insecure=insecure)
+    connpool.create = lambda: SimpleClient(
+        url=url, token=token, retries=retries)
 
     if container_populate:
         container_ring = Ring(swift_dir, ring_name='container')