utilFunctions: accept 2-4 digits as the SCB version

Note that the version number is used in other places, so that other tools may need some patches:

• https://ohwr.org/project/wr-switch-testing/-/blob/master/sw/wrs-pts/test/wrs/python/test02.py?ref_type=heads#L120
• https://ohwr.org/project/wr-switch-testing/-/blob/master/sw/wrs-pts/test/wrs/python/utilFunctions.py?ref_type=heads#L637