request #6841 Replace the combox by multiselect box in the System events monitor screen

Change-Id: Ic2307c19b5c07e4a065cc50d4577bd1946d2164c
Merge commit 'refs/changes/05/2405/4' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  request #6841 Replace the combox by multiselect box in the System events monitor screen

Change-Id: Ibe362b77bd8349f4ea017d3cce19e25cba776ef4
This is Tuleap 7.0.99.17

Change-Id: I5d401c9394a1bc3c4ba11ce8fd207c9b911fbe5f