make unit tests respect mongo port/host settings (with default)

settings are read in from environment variable

Conflicts:
	cms/envs/test.py
	common/lib/xmodule/xmodule/modulestore/tests/test_cross_modulestore_import_export.py
	common/lib/xmodule/xmodule/modulestore/tests/test_mongo.py

common/lib/xmodule/xmodule/modulestore/tests/django_utils.py

@@ -13,6 +13,7 @@ import datetime
 import pytz
 from xmodule.tabs import CoursewareTab, CourseInfoTab, StaticTab, DiscussionTab, ProgressTab, WikiTab
 from xmodule.modulestore.tests.sample_courses import default_block_info_tree, TOY_BLOCK_INFO_TREE
+from xmodule.modulestore.tests.mongo_connection import MONGO_PORT_NUM, MONGO_HOST
 
 
 def mixed_store_config(data_dir, mappings):
@@ -94,7 +95,8 @@ def split_mongo_store_config(data_dir):
             'NAME': 'draft',
             'ENGINE': 'xmodule.modulestore.split_mongo.split_draft.DraftVersioningModuleStore',
             'DOC_STORE_CONFIG': {
-                'host': 'localhost',
+                'host': MONGO_HOST,
+                'port': MONGO_PORT_NUM,
                 'db': 'test_xmodule',
                 'collection': 'modulestore{0}'.format(uuid4().hex[:5]),
             },

common/lib/xmodule/xmodule/modulestore/tests/test_mixed_modulestore.py

@@ -27,6 +27,7 @@ if not settings.configured:
 from xmodule.modulestore.mixed import MixedModuleStore
 from xmodule.modulestore.tests.mongo_connection import MONGO_PORT_NUM, MONGO_HOST
 from xmodule.modulestore.draft_and_published import UnsupportedRevisionError
+from xmodule.modulestore.tests.mongo_connection import MONGO_PORT_NUM, MONGO_HOST
 
 
 @ddt.ddt

common/lib/xmodule/xmodule/modulestore/tests/test_mongo.py

@@ -38,7 +38,6 @@ from xmodule.x_module import XModuleMixin
 from xmodule.modulestore.mongo.base import as_draft
 from xmodule.modulestore.tests.mongo_connection import MONGO_PORT_NUM, MONGO_HOST
 
-
 log = logging.getLogger(__name__)
 
 HOST = MONGO_HOST