ovs-dev.py: Add option to specify which tests to run.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
ovs-dev.py: Add option to run tests in parallel.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
datapath: Clean up files on distclean.

This was causing failures in 'make distcleancheck'.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Pravin B Shelar <pshelar@nicira.com>