Add fetching_user_source config option

Launchpad manages many information related to OpenStack at this
time, but the query takes much time for the processor. In addition,
stackalytics can be useful for OSS which are not managed with the
launchpad. So this patch adds a config option fetching_source so
that users can select fetching source. The default option is
'launchpad', so this patch doesn't affect at all on the default
option.

Change-Id: I4b7db745c36545e8897132cf6ccbb1c3fd6f3c07

stackalytics/tests/unit/test_record_processor.py

@@ -16,15 +16,19 @@
 import time
 
 import mock
+from oslo_config import cfg
 import six
 import testtools
 
+from stackalytics.processor import config
 from stackalytics.processor import record_processor
 from stackalytics.processor import runtime_storage
 from stackalytics.processor import user_processor
 from stackalytics.processor import utils
 
 
+CONF = cfg.CONF
+
 RELEASES = [
     {
         'release_name': 'prehistory',
@@ -67,6 +71,7 @@ class TestRecordProcessor(testtools.TestCase):
         self.lp_profile_by_email = (
             self.lp_profile_by_email_patch.start())
         self.lp_profile_by_email.return_value = None
+        CONF.register_opts(config.CONNECTION_OPTS + config.PROCESSOR_OPTS)
 
     def tearDown(self):
         super(TestRecordProcessor, self).tearDown()