Sort gerritbot/channels.yaml
Sort gerritbot/channels.yaml

Sort the file alphabetically by IRC channel name.
Right now entries have been often added at the bottom which leads easily
to merge conflicts.

Change-Id: Ib9dacbe7a29081707c20d210a3fc96fbe2745c82

dongwenjuan/project-config,anbangr/osci-project-config,Tesora/tesora-project-config,openstack-infra/project-config,open-switch/infra_project-config,coolsvap/project-config,noorul/os-project-config,open-switch/infra_project-config,dongwenjuan/project-config,Tesora/tesora-project-config,coolsvap/project-config,citrix-openstack/project-config,citrix-openstack/project-config,anbangr/osci-project-config,openstack-infra/project-config,noorul/os-project-config