Included 'Launch a stack' using dashboard procedure

New section 'Launch a stack' in the Dashboard chapter of User guide

Change-Id: I8212093d25982eede1c00b565f681f9eff898742
Updates conf reference for neutron ml2 plugin

Fixes-Bug: 1229237
Fixes-Bug: 1237662
Change-Id: I6974ea7d857b5186f39913baf43f3a8c321cc4ba
Merge "Updates conf reference for neutron ml2 plugin"
Merge "Included 'Launch a stack' using dashboard procedure"