Clean up oslo imports

We used to put `try / except ImportError` around oslo lib imports
to support both the `oslo_lib` and `oslo.lib` name patterns.

It is now useless since the newer versions of these libs all support
the `import oslo_lib` pattern.

Tested on CentOS 7 with the OpenStack Liberty repository.
Tested on Ubuntu 14.04 with OpenStack Liberty CloudArchive repository.

Change-Id: I7a147586d7a933506df62e34424e5fc57b3ff503
Sem-Ver: bugfix

synergy/common/config.py

@@ -1,7 +1,4 @@
-try:
-    from oslo_config import cfg
-except ImportError:
-    from oslo.config import cfg
+from oslo_config import cfg
 
 __author__ = "Lisa Zangrando"
 __email__ = "lisa.zangrando[AT]pd.infn.it"

synergy/common/service.py

@@ -3,10 +3,7 @@ import os
 import signal
 import sys
 
-try:
-    from oslo_config import cfg
-except ImportError:
-    from oslo.config import cfg
+from oslo_config import cfg
 
 
 __author__ = "Lisa Zangrando"

synergy/service.py

@@ -9,10 +9,7 @@ from cgi import escape
 from cgi import parse_qs
 from pkg_resources import iter_entry_points
 
-try:
-    from oslo_config import cfg
-except ImportError:
-    from oslo.config import cfg
+from oslo_config import cfg
 
 from synergy.common import config
 from synergy.common.manager import Manager