With the new run tool, there is no more is_qemu_available function. However,
some scripts still try to use it because only frequently used scripts were
updated by now. The commit replaces the function calls with the new
'have_include power_on/qemu' check.
Ref #1419
This patch changes the top-level directory layout as a preparatory
step for improving the tools for managing 3rd-party source codes.
The rationale is described in the issue referenced below.
Issue #1082