Add new allowable rules minimum/maximum_length

These checks are now supported by qc-osi-trace checker, so allow them in
the CI tests.

Signed-off-by: Pierre R. Mai <pmai@pmsf.de>

Author: pmai

rules.yml

@@ -11,3 +11,5 @@ first_element: '^[ ]\b(first_element)\b'
 last_element: '^[ ]\b(last_element)\b'
 check_if: '^[ ](\bcheck_if\b)(.*\belse do_check\b)'
 is_set: '^[ ]\b(is_set)\b'
+minimum_length: '^[ ]\b(minimum_length)\b: ([\s\d]+)$'
+maximum_length: '^[ ]\b(maximum_length)\b: ([\s\d]+)$'