tests: clobber the BUILD file in bazelize test

Darius Makovskyrequested to merge
traveltissues/clobber-in-test into master

We need to avoid duplicating these BUILD files but this must be done in a way that still allows for subpackaging, for now just clobber in the example.

tracking the actual fix at celduin/buildstream-bazel/issue-tracker#64

Edited by Darius Makovsky

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