Do not run heat/tools/nova_create_flavors.sh

This script takes a long time to run which will affect tempest
run times. Instead of running this, example templates will be modified
to align with the default heat flavors.

Change-Id: I588b1da9f5a02de3bf64ac8011d75c7d5432ef26
Stop quantum-ns-metadata-proxy process on unstack

Change function stop_quantum() in lib/quantum to also kill quantum-ns-metadata-proxy process

Fix Bug #1175658

Change-Id: I9e8f8437817cc645ab15eecfea1a134ea5ac13f2
Clean up horizon apache logs on unstack

It feels like the right think to do. Moreover it will avoid to display
horizon errors from a previous devstack run that would be displayed because
of the tail -f in start_horizon()

Change-Id: Id1ab272e60e0733a4feef3b85029f438f2273cb0
xenapi: Ubuntu installation repository/proxy fix

Get rid of UBUNTU_INST_REPOSITORY, use UBUNTU_INST_HTTP_HOSTNAME and
UBUNTU_INST_HTTP_DIRECTORY instead. User can also specify
UBUNTU_INST_HTTP_PROXY to utilize a proxy for the OpenStack VM
installation. The answer file will be edited to contain the specified
values. Also get rid of the magic, undocumented MIRROR variable.

This is related to blueprint xenapi-devstack-cleanup

Change-Id: Ic9fc564c4ad0f43e2e536854335ebe14791d0255
Merge "xenapi: Ubuntu installation repository/proxy fix"
Merge "Stop quantum-ns-metadata-proxy process on unstack"
Merge "Clean up horizon apache logs on unstack"
Merge "Do not run heat/tools/nova_create_flavors.sh"
Merge branch 'master' of github.com:openstack-dev/devstack