puppet: Read camo key from zulip-secrets.conf.

scripts/setup/generate_secrets.py

@@ -23,6 +23,8 @@ CAMO_CONFIG_FILENAME = '/etc/default/camo'
 AUTOGENERATED_SETTINGS = ['shared_secret', 'avatar_salt', 'rabbitmq_password', 'local_database_password',
                           'initial_password_salt']
 
+# TODO: We can eliminate this function if we refactor the install
+# script to run generate_secrets before zulip-puppet-apply.
 def generate_camo_config_file(camo_key):
     camo_config = """ENABLED=yes
 PORT=9292