test-multi: no longer expect testcase01, 12 and 13 to fail

'testcase01', 'testcase12' and 'testcase13' contain a strange mix of
exec and network events.

Nevertheless, there's enough information to parse them as good-enough
exec events. While this is not perfectly correct, it's better than
skipping these logs in this test.

Stop expecting that these profiles have a wrong content, and adjust them
so that they contain the (somewhat) expected exec rule.

libraries/libapparmor/testsuite/test_multi/testcase01.profile

@@ -1,4 +1,4 @@
 /bin/ping {
-  ping2 ix,
+  /bin/ping mrix,
 
 }

libraries/libapparmor/testsuite/test_multi/testcase12.profile

@@ -1,4 +1,4 @@
 /bin/ping {
-  /bin/ping ix,
+  /bin/ping mrix,
 
 }

libraries/libapparmor/testsuite/test_multi/testcase13.profile

@@ -1,4 +1,4 @@
 /bin/ping {
-  /bin/ping ix,
+  /bin/ping mrix,
 
 }

utils/test/test-libapparmor-test_multi.py

@@ -152,11 +152,6 @@ log_to_skip = [
 
 # tests that do not produce the expected profile (checked with assertNotEqual)
 log_to_profile_known_failures = [
-    # exec events
-    'testcase01',
-    'testcase12',
-    'testcase13',
-
     # 'testcase31',  # works, but including the link source would be nice
 ]