block: rename BlkTransactionState and BdrvActionOps

block: rename BlkTransactionState and BdrvActionOps

These structures are misnomers, somewhat.

(1) BlockTransactionState is not state for a transaction,
    but is rather state for a single transaction action.
    Rename it "BlkActionState" to be more accurate.

(2) The BdrvActionOps describes operations for the BlkActionState,
    above. This name might imply a 'BdrvAction' or a 'BdrvActionState',
    which there isn't.
    Rename this to 'BlkActionOps' to match 'BlkActionState'.

Lastly, update the surrounding in-line documentation and comments
to reflect the current nature of how Transactions operate.

This patch changes only comments and names, and should not affect
behavior in any way.

Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1446765200-3054-4-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>