[DM] Change ansible version from 2.4.2 to 2.4.3
[DM] Change ansible version from 2.4.2 to 2.4.3

Change-Id: I3bd7ae1233b2287a3b9bd63bf715bf3eb6a7e212
Closes-Bug: #1762621

Juniper/contrail-packages,Juniper/contrail-packages