Normalize channels.yaml
Normalize channels.yaml

gerritbot/channels.yaml is a mix of 2- and 4-space indents.
In order to simplify programmatic manipulation of this file,
this makes all indentation 2 spaces.

In addition, it sorts the lists of projects for each channel.

This is motivated by the upcoming mass stackforge namespace renames.

Change-Id: Icfeefe5afb4cb1b73d7a82ca79892d6a01e711bd

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