KVM test: kvm_subprocess: use read_nonblocking(0) instead of read_nonblocking (0.1)
In get_command_status_output() and is_responsive() use read_nonblocking(0) to
read the unread output before sending input (e.g. a command).
The timeout is currently 0.1 because theoretically it should help if the guest
still produces output when the function is called, but in practice there's no
guarantee that a value of 0.1 will suffice. Therefore, it is be the user's
responsibility to make sure the guest stopped producing output before
get_command_status_output() is called. This can be guaranteed (in most cases)
by using get_command_status_output() and friends instead of sendline() to send
commands (because the former waits for the prompt to return, whereas the latter
returns immediately).
Signed-off-by: Michael Goldish <mgoldish@redhat.com>
git-svn-id: http://test.kernel.org/svn/autotest/trunk@3793 592f7852-d20e-0410-864c-8624ca9c26a4
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