object-storage: DiskAccount subclassing of DiskDir

Changes to make DiskAccount subclass DiskDir complete. This change helps
reduce the diffs ahead of further refactoring. Note that DiskDir initializes
all the same fields as DiskAccount, plus a few more, and ends up reading the
metadata properly, while only adding a couple of fields not used for account
purposes.

This change also passes the account controller's logger for use by the
DiskAccount class.

Along the way we:

    * Remove the redundant update_account() method in the DiskCommon base
      class, since the update_container() method in DiskDir performs the exact
      same functionality

    * Remove the initialization of variables ahead of assignments in two
      cases, and also move the initialization of the list variables closer to
      where they are used

    * Collapse the imports from swift.plugins.utils into one statement

    * Use a temporary directory for the db_file.db when we find ourselves in a
      unit test environment

Change-Id: I4dc59b416a66393adfe0ed32c7a62c79731d70c0
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Reviewed-on: http://review.gluster.org/4172
Reviewed-by: Pete Zaitcev <zaitcev@redhat.com>
Tested-by: Pete Zaitcev <zaitcev@redhat.com>
Reviewed-by: Mohammed Junaid <junaid@redhat.com>

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