Updated openstack/openstack
Project: openstack/horizon  33418ba861c4e8899f8ff897a6835dc59f347d44
null
Improve docs about horizon settings

added ALLOWED_HOSTS
added SESSION_TIMEOUT

Since settings become longer and longer, I re-arranged the options
in alphabetical order.

Change-Id: I4424cc178ec0cd7892b0f07cb0192b5af5b2ee0d
Partial-bug: #1221115