oeqa/QemuRunner: don't use bb for logging
Instead of using bb.note() etc for logging use logging.Logger directly, allowing
the use of QemuRunner outside of bitbake.
Also clean up the logging/errors by moving create_socket() out of
__init__()/restart() and into start().
(From OE-Core master rev:
519e381278d40bdac79add340e4c0460a9f97e17)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Joshua Lock <joshua.lock@collabora.co.uk>
