//internal/common:check_version_test breaks with Bazel HEAD

[laszlocsomor]

CI link: https://buildkite.com/bazel/bazel-at-head-plus-downstream/builds/1026#47ba3e35-d7ad-4ca8-9439-0bd8e9f602e9

Source tree: 4c62d33

Bazel version: built at bazelbuild/bazel@12c7942

Test log:

exec ${PAGER:-/usr/bin/less} "$0" || exit 1
Executing tests from //internal/common:check_version_test
-----------------------------------------------------------------------------
Error occurred while attempting to use the default Python toolchain (@bazel_tools//tools/python:autodetecting_toolchain).
According to '/usr/bin/python -V', version is 'Python 2.7.10', but we need version 3. PATH is:

.:/bin:/usr/bin

Please ensure an interpreter with version 3 is available on this platform as 'python3' or 'python', or else register an appropriate Python toolchain as per the documentation for py_runtime_pair (https://github.com/bazelbuild/bazel/blob/master/tools/python/toolchain.bzl).

Note that prior to Bazel 0.27, there was no check to ensure that the interpreter's version matched the version declared by the target (#4815). If your build worked prior to Bazel 0.27, and you're sure your targets do not require Python 3, you can opt out of this version check by using the non-strict autodetecting toolchain instead of the standard autodetecting toolchain. This can be done by passing the flag `--extra_toolchains=@bazel_tools//tools/python:autodetecting_toolchain_nonstrict` on the command line or adding it to your bazelrc.

[laurentlb]

cc @brandjon

[brandjon]

Dup of #809.