qemuimagetest/scenario: Move dmesg to end of test run

The dmesg test detects segfaults. This is useful information to have and if one
occurs in one of the earlier tests, this can aid debugging. Move the dmesg test to
the end of the list of tests so we gain the extra debug info in those cases.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
udev: Move udevd back to /sbin

Along with v182 upgrade udevd was moved to ${base_libdir}
making scripts like init-live.sh to fail in finding udevd.

We have some problems here since the placing binaries into either
libdir breaks the way our multilib handling works. That code and its
associated sanity tests assume that libdir contains binaries of a
particular architecture and that these are not allowed to overlap.

This is in contrast to the bindirs where conflicts are expected
and handled appropriately.

So whilst upstream may desire this directory layout, it won't work
for OE's usage of it and we need to configure udev differently. The
scripts already have fallback code to handle udev in the two locations
so there is no issue is going back to our previous layout.

[Yocto #4046]

Signed-off-by: Radu Moisan <radu.moisan@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>