Remove connection_type in Grizzly

[Sean Dague]

The code supporting connection type should be removed once we've branched off Folsom into a stable tree

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/13913

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/13913
Committed: http://github.com/openstack/nova/commit/625996722f08b57b2926cf4d6aff5fe03abc196c
Submitter: Jenkins
Branch: master

commit 625996722f08b57b2926cf4d6aff5fe03abc196c
Author: Sean Dague <email address hidden>
Date: Mon Oct 1 11:44:55 2012 -0400

    remove deprecated connection_type flag

    Fixes bug #1025712

    connection_type was deprecated in Folsom and should now
    be removed in Grizzly as early as possible to shake out
    any fallout. This removes all references to it, changes
    the config sample and tests appropriately.

    Remove old default fixtures for flavors that specify
    ephemeral disks if the connection_type flag was set to
    'libvirt'

    Change-Id: I8af831600a1931ae92c6d06c5105bd1bd81debe3