NXP-16154 merged tag listeners (should process event in sequence according to the calling tx) + test

commit 4142ab613b3d63cdd6e0bdef6256cab03f92969d
Author: Stephane Lacoin aka nxmatic <slacoin@nuxeo.com>
Date:   Mon Dec 8 15:54:49 2014 +0100

    NXP-16154 merged tag listeners (should process event in sequence according to the calling tx)

commit 75a91dc7f978630915eb75003f4ba42f1867eed9
Author: Benoit Delbosc <bdelbosc@nuxeo.com>
Date:   Fri Dec 5 15:48:37 2014 +0100

    NXP-16154: Add a unit test to reproduce the problem