Change to allow egg launching from a URI.  Tested with
bin/nosetests ion/agents/instrument/test/test_driver_process.py
Also will work with ion/services/sa/test/test_driver_egg.py once that code is brought in from Ian.
removed trailing slash in repo base per swarbhanu.
Merge pull request #489 from unwin/master

launch driver process from egg working.

Smoke tests are passing on dev machines.
dial back loglevel for very verbose message
first draft of conditionally launching from egg
test for driver egg launch with skips for broken functionality
tests validating egg launch, one skipped due to lack of raised error