qemuimage-testlib: Fix the check for running qemu processes
Previously, any active command containing the word "qemu" including
in the command path would trigger a "success" result for detecting
the qemu process. This change fixes the check to search for commands
starting with "qemu" and ignores pathnames.
It also shortens the timeout for the qemu process to appear to 10
seconds. If it doesn't appear in that time there is always a problem.
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
