fix: remove erroneous timeouts for batch_create_session calls (#18)

* fix: remove erroneous timeouts for batch_create_session calls in session pools * blacken

Author: larkee

google/cloud/spanner_v1/pool.py

@@ -171,10 +171,7 @@ def bind(self, database):
 
  while not self._sessions.full():
  resp = api.batch_create_sessions(
- database.name,
- self.size - self._sessions.qsize(),
- timeout=self.default_timeout,
- metadata=metadata,
+ database.name, self.size - self._sessions.qsize(), metadata=metadata
  )
  for session_pb in resp.session:
  session = self._new_session()
@@ -365,10 +362,7 @@ def bind(self, database):
 
  while created_session_count < self.size:
  resp = api.batch_create_sessions(
- database.name,
- self.size - created_session_count,
- timeout=self.default_timeout,
- metadata=metadata,
+ database.name, self.size - created_session_count, metadata=metadata
  )
  for session_pb in resp.session:
  session = self._new_session()