Ensure all needles contain timestamp in filename

[asdil12]

Ticket: https://progress.opensuse.org/issues/53171

For existing broken needles: fix_timestamp.sh

#!/bin/bash

needle=$1
timestamp=$(git log --date=short "$needle.json" | grep Date | awk '{print $2}' | tr -d - | head -n1)

git mv -v "$needle.json" "$needle-$timestamp.json"
git mv -v "$needle.png" "$needle-$timestamp.png"

./tests/test.py |& awk -F "'" '{print $2}' | while read line ; do ./fix_timestamp.sh $line ; done

This commit will also change the testsuite subproject to os-autoinst/os-autoinst-needles-tests@ed4c973 and thereby use the new testsuite that checks for timestamps.