run.py: Provide --os-{type,version} values to get_initial_tasks
run.py: Provide --os-{type,version} values to get_initial_tasks

We want to be able to check the final values of os_type and os_version
in get_initial_tasks, so move the command-line override up to before
the get_initial_tasks() method call.

Signed-off-by: Nathan Cutler <f9d8c66a4e898e67db786769b5b347b640e1a9a6@suse.com>

ceph/teuthology,dmick/teuthology,SUSE/teuthology,dmick/teuthology,ceph/teuthology,SUSE/teuthology,SUSE/teuthology,ktdreyer/teuthology,ktdreyer/teuthology,dmick/teuthology