Merge branch 'jc/denoise-rm-to-resolve'

"git rm" to resolve a conflicted path leaked an internal message
"needs merge" before actually removing the path, which was
confusing.  This has been corrected.

* jc/denoise-rm-to-resolve:
  rm: resolving by removal is not a warning-worthy event

diff --cc builtin/rm.c
Simple merge

diff --cc t/t3600-rm.sh
Simple merge