Drop log_method decorator

As a result of the recent logging refactoring, log_method decorator
is no longer required. oslo.log provides a similar decorator
oslo_log.helpers.log_method_call. If a similar feature is needed,
we can use the decorator from oslo_log.

searchlightclient is the only OSC external plugin which uses this
decorator. The depending patch removes it, so we can safely drop
the decorator.

Change-Id: If3df09cf6aa0a401d9f89e8924adce851d0c6dec
Depends-On: Ib94e7ba77262a9a8cbfce71f3083c47cb1973364

openstackclient/common/utils.py

@@ -26,33 +26,6 @@ from oslo_utils import importutils
 from openstackclient.common import exceptions
 
 
-class log_method(object):
-
-    def __init__(self, log=None, level=logging.DEBUG):
-        self._log = log
-        self._level = level
-
-    def __call__(self, func):
-        func_name = func.__name__
-        if not self._log:
-            self._log = logging.getLogger(func.__class__.__name__)
-
-        @six.wraps(func)
-        def wrapper(*args, **kwargs):
-            if self._log.isEnabledFor(self._level):
-                pretty_args = []
-                if args:
-                    pretty_args.extend(str(a) for a in args)
-                if kwargs:
-                    pretty_args.extend(
-                        "%s=%s" % (k, v) for k, v in six.iteritems(kwargs))
-                self._log.log(self._level, "%s(%s)",
-                              func_name, ", ".join(pretty_args))
-            return func(*args, **kwargs)
-
-        return wrapper
-
-
 def find_resource(manager, name_or_id, **kwargs):
     """Helper for the _find_* methods.