maintner/maintnerd: remove debugging left in by mistake from earlier CL
maintner/maintnerd: remove debugging left in by mistake from earlier CL

I added this while verifying CL 209967 worked (to cut down on log
spam) but forgot to remove it.

Change-Id: I906470b260f311b98f838aba072bf39ee02dd09c
Reviewed-on: https://go-review.googlesource.com/c/build/+/210282
Reviewed-by: Matt Layher <76528ff2e917253aa2211f68e4ca60b5b846dcf5@gmail.com>

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