Add ansible raw task note, add apt-get update
Add ansible raw task note, add apt-get update

Add note about raw install
Add apt-get update before install python

TrivialFix
Closes-Bug: #1618297

Change-Id: I08372dcfe71dff8c0a50a421788309b642e2a521

mandre/kolla,dardelean/kolla-ansible,mrangana/kolla,coolsvap/kolla,nihilifer/kolla,dardelean/kolla-ansible,mandre/kolla,stackforge/kolla,stackforge/kolla,GalenMa/kolla,openstack/kolla,mrangana/kolla,intel-onp/kolla,stackforge/kolla,mandre/kolla,dardelean/kolla-ansible,GalenMa/kolla,rahulunair/kolla,rahulunair/kolla,coolsvap/kolla,intel-onp/kolla,nihilifer/kolla,openstack/kolla,coolsvap/kolla