OOIION-584 tests validating egg launch, one skipped due to lack of raised error

5 INT tests demonstrating launch of an instrument agent instance:
* "old way", using module and class name
* "old way" plus URI, in which case URI is used
* URI only, no module+class
* URI with a BOGUS module+class
* launching a "bad" egg and noting its failure

One skipped INT test:
* attempting to launch an egg with a 404'd URI.  

The skipped test requires the 404 error (from the egg download) to be raised.  Roger will look into this.