[bare-metal] Should remove the temp workaround

[Ma Wen Cheng]

Since the Kilo branch is beginning, patches https://review.openstack.org/#/c/148458/ and https://review.openstack.org/#/c/148463/ have been merged.
so need to remove the temp workaround included:
common attributes:
    https://github.com/wenchma/cookbook-openstack-bare-metal/blob/master/attributes/common-temp.rb#L21
db creation default recipe:
    https://github.com/wenchma/cookbook-openstack-bare-metal/blob/master/recipes/default.rb#L25

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/162049

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/162049
Committed: https://git.openstack.org/cgit/stackforge/cookbook-openstack-bare-metal/commit/?id=673627d9e5d5c9c0aab269fa8dd633c4a3c3c773
Submitter: Jenkins
Branch: master

commit 673627d9e5d5c9c0aab269fa8dd633c4a3c3c773
Author: wenchma <email address hidden>
Date: Fri Mar 6 16:07:01 2015 +0800

    Remove the temp workaround of common attributes and db creation

    https://review.openstack.org/#/c/148458/ and
    https://review.openstack.org/#/c/148463/
    have been merged.

    Change-Id: I6495b3dd0f6d3a40acbb20194f0fd50c6099f9aa
    Closes-bug: #1428985