Allow keystone to run from apache

Provide a template for running keystone as a mod_wsgi process and enable
it from configuration.

Based on: https://review.openstack.org/#/c/36474/
Also-by: zhang-hare <zhuadl@cn.ibm.com>
Implements: blueprint devstack-setup-apache-keystone

Change-Id: Icc9d7ddfa4a488c08816ff4ae0b53c0134a1016b
xenapi: Get rid of prompt settings

Remove the setting of prompt from prepare guest, keeping the scripts
smaller.

Change-Id: Ifb2b3aba07831e1552d6a1c6cd2081592c43ccf6
fix tee errors

Do not specify /dev/fd3 directly, use >&3 instead. This change enables
to use stack.sh as an upstart script, and with VERBOSE=False, it will
print the expected messages.

Fixes bug 1230342

Change-Id: I6e3a81fd435e8c46d553bfdee08f8bf42d0f4387
Merge "xenapi: Get rid of prompt settings"
Merge "Allow keystone to run from apache"
Merge "fix tee errors"
Merge branch 'master' of github.com:openstack-dev/devstack