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
diff --git a/tools/bazel.rc b/tools/bazel.rc
deleted file mode 100644
index 4ed16cf..0000000
--- a/tools/bazel.rc
+++ /dev/null
@@ -1,2 +0,0 @@
-build --workspace_status_command=./tools/workspace-status.sh
-test --build_tests_only