Fixing API regression tests.
Fixing API regression tests.

Stubbing psutil.Process, otherwise tests fail when there's no process
with pid=42 on the system.

google/grr,pidydx/grr,google/grr,dunkhong/grr,dunkhong/grr,pidydx/grr,pidydx/grr,dunkhong/grr,google/grr,dunkhong/grr,dunkhong/grr,dunkhong/grr,google/grr,google/grr,pidydx/grr,pidydx/grr,dunkhong/grr,google/grr,google/grr,pidydx/grr,pidydx/grr