PATCH: [zorg] Add sanitizer build factory for sanitizer bots setup

[Alexey Samsonov]

Hi, Galina!

We have our private buildbots that run tests for sanitizer projects
(AddressSanitizer, ThreadSanitizer,
MemorySanitizer etc.), but we'd like to make them visible to LLVM
community, and ease the process
of adding more bots by contributors (e.g. Bill is interested in the bot on
PowerPC).

This patch adds two files:
1) zorg/buildbot/commands/AnnotatedCommand.py is a handy buildbot command
copied from Chromium project. It can run a random shell command and parse
its output to understand build steps
and their results. This makes writing buildbot scripts much easier, as one
don't have to implement a custom "step" in Python every time.

2) zorg/buildbot/builders/SanitizerBuilder.py implements a build factory to
test sanitizers (AddressSanitizer, ThreadSanitizer, MemorySanitizer etc).
Note that actual buildbot scripts are
somewhat complicated and are stored in a separate repository:
https://code.google.com/p/address-sanitizer/source/browse/#svn%2Ftrunk%2Fbuild%2Fscripts%2Fslave
Using AnnotatedCommand will allow us to update buildbot scripts w/o
modifying master on zorg.

-- 
Alexey Samsonov, MSK
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