Migrate `tools/bazel.rc` to `.bazelrc`

Since [1], Bazel changed the list of resource file locations.
Adapt to that list and move `%workspace%/tools/bazelrc` to
`%workspace%/.bazelrc`.

[1] https://github.com/bazelbuild/bazel/commit/ec83598

Change-Id: I1b14807b37c9bf8f26eb086f6c1020c542be4727
1 file changed