[PATCH] [Static Analyzer] Minor improvements to SATest

[Gábor Horváth]

Hi zaks.anna, jordan_rose, dcoughlin,

The following improvements were made:
* Argument parsing was ported to argparse which is more idiomatic for python scripts nowadays
* Added strictness command line option so build bots can fail when there is a difference from the reference results
* The test should no longer fail when there is an empty line in the build command file

http://reviews.llvm.org/D10812

Files:
  utils/analyzer/CmpRuns.py
  utils/analyzer/SATestBuild.py

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