Log Message:
Update databases/py-cassandra-driver to 3.5.0.

Features
- Optional Execution Profiles for the core driver (PYTHON-569)
- API to get the host metadata associated with the control
  connection node (PYTHON-583)
- Expose CDC option in table metadata CQL (PYTHON-593)

Bug Fixes
- Clean up Asyncore socket map when fork is detected (PYTHON-577)
- cqlengine: QuerySet only() is not respected when there are
  deferred fields (PYTHON-560)