baremetal deploy helper wastes nova-compute host pagecache

[Robert Collins]

The baremetal deploy helper dd's images to the target machine. This is done without oflag=direct, which means that for a 1GB image, we use up ~1GB of local pagecache. This is wasteful, as we won't read any substantial amount of the image back.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/23480

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/23480
Committed: http://github.com/openstack/nova/commit/de4b35a4ca3a98c084ca4dc4812d1f5d7e1edddb
Submitter: Jenkins
Branch: master

commit de4b35a4ca3a98c084ca4dc4812d1f5d7e1edddb
Author: Devananda van der Veen <email address hidden>
Date: Mon Mar 4 15:01:03 2013 -0800

    Baremetal deploy helper sets ODIRECT.

    Baremetal deploy helper should set oflag=direct when dd'ing images onto
    iSCSI targets, so that it doesn't waste the local page cache.

    Fixes bug 1114633.

    Change-Id: Ia674afb34aff7b842cfcd520ecb7b75dc21944fa