Skipping p4 and svn requiring tests in test_assembla.py if those modules are not present

Review Request #7867 — Created Jan. 15, 2016 and submitted — Latest diff uploaded

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master

Reviewers

Certain tests in test_assembla.py which involve importing P4 or svn integration fail if those modules aren't installed.
I think we should skip them instead!

Now we respond to an ImportError being raised by skipping that test.

Ran unit tests in test_assembla.py - four tests that previously failed due to ImportError are now skipped.