cmd/coordinator: add newline between also tested repo names
cmd/coordinator: add newline between also tested repo names

Change-Id: Iad4e772d61ebe8bb427e401c2a22d2948cb4d8fb
Reviewed-on: https://go-review.googlesource.com/c/build/+/204077
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

golang/build,golang/build,golang/build,golang/build