Fix a couple of SharedLock docstrings

Use the actual class name rather than a spaced version of it.

Reviewed-by: iustinp

lib/locking.py

@@ -38,7 +38,7 @@ class SharedLock:
 
   """
   def __init__(self):
-    """Construct a new Shared Lock"""
+    """Construct a new SharedLock"""
     # we have two conditions, c_shr and c_exc, sharing the same lock.
     self.__lock = threading.Lock()
     self.__turn_shr = threading.Condition(self.__lock)

test/ganeti.locking_unittest.py

@@ -32,7 +32,7 @@ from threading import Thread
 
 
 class TestSharedLock(unittest.TestCase):
-  """Shared lock tests"""
+  """SharedLock tests"""
 
   def setUp(self):
     self.sl = locking.SharedLock()