xenapi: Move settings to their own config section

[OpenStack Infra]

https://review.openstack.org/54870
commit 4f7cedbeb01ee0e54a44603271b383308a2f4f5d
Author: Christopher Lefelhocz <email address hidden>
Date: Wed Oct 30 07:57:43 2013 +0000

    xenapi: Move settings to their own config section

    This commit changes xenapi_* config options to their own section
    with the xenapi_ prefix removed where appropriate. The change
    is done in a backwards compatible fashion such that previous
    nova.conf files still work.

    As part of this update the sample file and text strings are
    also updated to reflect new config options. Test cases have
    been adjusted to handle the config hierarchy.

    2642897d6f5b8a211424519d99feddc89c3bf180 was followed to
    implement this change.

    Change-Id: I2e9f720ddce284fc112d6a5651fd277e6e31a17a
    Closes-Bug: 1207253
    DocImpact

[Tom Fifield (fifieldt)]

This is blocked by need to redocument xen
https://blueprints.launchpad.net/openstack-manuals/+spec/redocument-xen