Clean up imports in hostingsvcs and scmtools tests

Review Request #4294 — Created July 5, 2013 and submitted — Latest diff uploaded

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master

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Clean up imports in hostingsvcs and scmtools tests

This cleans up the now-obsolete md5-vs-hashlib fallbacks, as well as imports
much more specific items (in most of scmtools/tests.py's imports, we only cared
about a single symbol).
Ran unit tests.