Replace usage of native http/git rules
Replace usage of native http/git rules

Per https://groups.google.com/d/msg/bazel-discuss/dO2MHQLwJF0/2OXHjMAaAAAJ the native
implementations of these rules will be retired in favour of their skylark
versions. Replace usage with the skylark versions and test with:

```
--incompatible_remove_native_git_repository --incompatible_remove_native_http_archive
```

bazelbuild/bazel-integration-testing,bazelbuild/bazel-integration-testing,bazelbuild/bazel-integration-testing