Read more settings out of /etc/clearwater/config
Apply changes to Homer as well
Typo fix
Removing unused fields from local_settings.py
Don't quote non-string values in local_settings.py
Remove ability to set COOKIE_SECRET option
Applying code review feedback

  * Pre-setting sensible Cassandra and HSS defaults in local_settings.py
  * Moving config specific to Homestead (e.g. HSS settings, password encryption key) out of the Crest-wide settings.py
Re-adding SPROUT_HOSTNAME variable
Merge pull request #16 from Metaswitch/hss_conf_in_clearwater_config

{Reviewer - Felix} Move HSS conf into /etc/clearwater/config