This will run Python "coverage" tool instead of Python itself
for the python test scripts.

Then "make check" will create python coverage data which
can make a report.
I will also add make targets for creating reports later.


git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac362@3136 e5f2f494-b856-4b98-b285-d166d9295462