Add test to pull from instance for Coverage Calc

Add a test and python file to export/unpack all routines from the VistA
instance during testing.  Change the path in the *mcov files to use this
directory as the source for the coverage calculations.

This ensures that the routines being run during the test are used as the
source instead of the VistA-M repository.

OSEHRA-Id: http://issues.osehra.org/browse/OAT-139
Change-Id: I73378e50cf65f4b1366baf27eb0e8359435765ea