[PATCH] Refactor sanitizer build scripts.

[Sergey Matveev]

- address nits


http://reviews.llvm.org/D6710

Files:
  zorg/buildbot/builders/sanitizers/buildbot_bootstrap.sh
  zorg/buildbot/builders/sanitizers/buildbot_fast.sh
  zorg/buildbot/builders/sanitizers/buildbot_functions.sh

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