vchoi_fork

[svn-r12366] Purpose:
fix.

Description:
More machines stop supporting "rsh machine command".
Worse yet, it hangs the "rsh machine command" process.

Solution:
Switch the order of testing remote execution to use
ssh first, then rsh.

Platforms tested:
no h5committest since it does not test this command.
Change is trivial and will monitor Daily test tonight.