xenapi: cleanup VM Installation

VM installation created a machine with multiple network interfaces. This
is a needless complexity at that point, we only need one interface. This
change removes the complex network interface setup from
install-os-vpx.sh script, so that only one network interface is created,
which is connected to the selected network (management by default). This
change also removes a lot of non-used code from install-os-vpx.sh
Specify the network to be used for ubuntu netinstall with:

    UBUNTU_INST_BRIDGE_OR_NET_NAME

defaults to $MGT_BRIDGE_OR_NET_NAME.

This change also includes:
 - use precise as default

Related to blueprint xenapi-devstack-cleanup

Change-Id: Ib0a0a316e849f2c2651305ea657c84820cd2bb3b
Enable configuration of Identity API v3

* Default IDENTITY_API_VERSION to '2.0' in stackrc

Note: the value of these *_API_VERSION variables will NOT include
the leading 'v' as the CLI tools do not allow it.

Change-Id: Ic6473833be35625282e7442f3c88fc1c4d0cc134
Set the correct URLs in the version return data

The URLs advertised in the data returned by keystone's '/' route default
to localhost and is not usable from off-host.  Not that anything in
DevStack uses it (yet).

Change-Id: I049789f568eff48c1abb0678c3ac0ae8a8960c64
Enable all notifications update from Nova for Ceilometer

This will allow Ceilometer to grab even more events about instances states
changes.

Change-Id: Ie28258607695caf96dcfa292cb74355aced85ccf
Set the scenario/img_dir option for tempest.conf

The default value does not work unless devstack is installed in
/opt/stack/new/devstack. This patch changes the img_dir option to point
to the correct install location.

Change-Id: Iea41d209dad10b2f9a7c97efd55c39a8d29347cc
More neutron renames

Rename quantum-adv-test.sh and the package prereq files in files/*/quantum

Change-Id: I4dab635c2ae79f1f42a9cfdadbf7a4d06cf2b925
Merge "Set the scenario/img_dir option for tempest.conf"
Merge "xenapi: cleanup VM Installation"
Merge "Enable configuration of Identity API v3"
Merge "Set the correct URLs in the version return data"
Merge "Enable all notifications update from Nova for Ceilometer"
Merge "More neutron renames"
Merge branch 'master' of github.com:openstack-dev/devstack