Disable SSE notifications

Disable SSE notifications

By default in Aluminium, SSE (Server Side Events) are enabled
and websocket notfications are disabled. The existing CSIT
test cases expect websocket notifications to work. For now
we need to disable SSE to allow the test cases to pass with
websockets.

This will be a NOOP for Mg and Na, although the controller
restart is a small waste of time (~2min).

In the future, tests cases for SSE will be written and doing
this config change and restart in the suite setup will
probably not make sense.

JIRA: INTTEST-107

Signed-off-by: Lukas Baca <lbaca@luminanetworks.com>
Change-Id: I0dc87e2731927c2ec61c683d1a2f238e2b03e8d0
Signed-off-by: Lukas Baca <lbaca@luminanetworks.com>