PYTHON-1558 Use nameOnly option in list_collection_names and collection_names methods

Author: prashantmital

pymongo/database.py

@@ -597,7 +597,8 @@ def list_collection_names(self, session=None):
  .. versionadded:: 3.6
  """
  return [result["name"]
- for result in self.list_collections(session=session)]
+ for result in self.list_collections(session=session,
+ nameOnly=True)]
 
  def collection_names(self, include_system_collections=True,
  session=None):
@@ -614,7 +615,8 @@ def collection_names(self, include_system_collections=True,
  """
  kws = {} if include_system_collections else _SYSTEM_FILTER
  return [result["name"]
- for result in self.list_collections(session=session, **kws)]
+ for result in self.list_collections(session=session,
+ nameOnly=True, **kws)]
 
  def drop_collection(self, name_or_collection, session=None):
  """Drop a collection.