Add mongodb to docker_templates
Add mongodb to docker_templates

Change-Id: I0adbc986f02b22c90019b76784153a9accac663f
Partially-Implements: blueprint dockerfile-template

intel-onp/kolla,HackToday/kolla,coolsvap/kolla,negronjl/kolla,rahulunair/kolla,rajalokan/kolla,HackToday/kolla,stackforge/kolla,mandre/kolla,chenzhiwei/kolla,openstack/kolla,fdumpling/kolla,fdumpling/kolla,stackforge/kolla,openstack/kolla,rajalokan/kolla,stackforge/kolla,intel-onp/kolla,mandre/kolla,GalenMa/kolla,limamauricio/mykolla,HackToday/kolla,tonyli71/kolla,GalenMa/kolla,coolsvap/kolla,limamauricio/mykolla,jakedahn/kolla,nihilifer/kolla,negronjl/kolla,negronjl/kolla,toby82/kolla,tonyli71/kolla,limamauricio/mykolla,jakedahn/kolla,rajalokan/kolla,mandre/kolla,jakedahn/kolla,toby82/kolla,dardelean/kolla-ansible,mrangana/kolla,dardelean/kolla-ansible,dardelean/kolla-ansible,chenzhiwei/kolla,mrangana/kolla,fdumpling/kolla,toby82/kolla,nihilifer/kolla,coolsvap/kolla,chenzhiwei/kolla,rahulunair/kolla