Fix dbPath typo in templates/mongodb.json.j2
Fix dbPath typo in templates/mongodb.json.j2

During mongodb upgrade process "/var/lib/mongodb" should have
correct permissions, but a typo present in config.json was giving
permissions to "/var/lib/kolla/mongodb"

Change-Id: I916e7d831531131b2f141a2f7ac712d4a82f7e86
Closes-Bug: #1668303

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible