fix logging in DataSource modules

Previous logging was getting 'None' set in the DataSource collections.
Thus, 'log.debug' would throw error.  I think it is proper to pull in
the base cloudinit's log.

cloudinit/DataSource.py

@@ -22,15 +22,6 @@ DEP_NETWORK = "NETWORK"
 
 import UserDataHandler as ud
 
-log = None
-def setlog(log_in=None, name="DataSource"):
-    log = log_in
-    if log is None:
-        class NullHandler(logging.Handler):
-            def emit(self,record): pass
-        log = logging.getLogger(name)
-        log.addHandler(NullHandler())
-
 class DataSource:
     userdata = None
     metadata = None

cloudinit/DataSourceEc2.py

@@ -17,9 +17,8 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import DataSource
-log = DataSource.log
 
-from cloudinit import seeddir
+from cloudinit import seeddir, log
 import cloudinit.util as util
 import socket
 import urllib2

cloudinit/DataSourceNoCloud.py

@@ -17,9 +17,8 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import DataSource
-log = DataSource.log
 
-from cloudinit import seeddir
+from cloudinit import seeddir, log
 import cloudinit.util as util
 import sys
 import os.path

cloudinit/DataSourceOVF.py

@@ -18,7 +18,7 @@
 
 import DataSource
 
-from cloudinit import seeddir
+from cloudinit import seeddir, log
 import cloudinit.util as util
 import sys
 import os.path

cloudinit/__init__.py

@@ -102,7 +102,6 @@ def logging_set_from_cfg(cfg):
 
 
 import DataSource
-DataSource.setlog(log)
 import UserDataHandler
 
 class CloudInit: