Reindent swift3 consistently
Reindent swift3 consistently

In gerritbot/channels.yaml, make all indentation 2 spaces again.

Change-Id: I8437b8c461685983cd9535f0e7920a53ea85b2d0

dongwenjuan/project-config,Tesora/tesora-project-config,noorul/os-project-config,noorul/os-project-config,Tesora/tesora-project-config,dongwenjuan/project-config,openstack-infra/project-config,openstack-infra/project-config