python-smartpm: use md5 as the digest for rpm_sys channel
Use md5 sum instead of mtime as the "digest" method for rpm_sys channel.
The digest is used to determine if the channel has been updated. It was
found out that mtime was not a reliable digest. On some systems mtime
of the rpm db does not get updated after every transaction if transactions
(smart install / remove commands) are fired in quick succession. As a
consequence smartpm cache and rpm db get out of sync.
[YOCTO #10244]
Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
