tests: add hack to avoid problem with graphlog in unified tests

tests/run-tests.py

@@ -503,6 +503,9 b' def tsttest(test, options):'
 
     def rematch(el, l):
         try:
+            # hack to deal with graphlog, which looks like bogus regexes
+            if el.startswith('|'):
+                el = '\\' + el
             return re.match(el, l)
         except re.error:
             # el is an invalid regex