Remove tools/bazel.rc
Remove tools/bazel.rc

The file was moved to /.bazelrc on stable-2.14 by commit 779508b,
but accidentally added back by 31c55ab on stable-2.15.

Change-Id: Ib2fb5db384b8388e691f294269c82a52c0998ae0

GerritCodeReview/plugins_owners,GerritCodeReview/plugins_owners