Handle symlink log events in aa-logprof

Nobody told the tools that log events with operation="symlink" exist.
Add this keyword to the list of file or network operations (I don't
expect network symlinks ;-) but keeping everything in that list makes
things easier than special-casing it.)

Also add the log sample and expected result to the libapparmor tests.

Fixes https://gitlab.com/apparmor/apparmor/-/issues/107

libraries/libapparmor/testsuite/test_multi/symlink.in

@@ -0,0 +1 @@
+Aug  3 00:00:41 liuchao-virtual-machine kernel: [ 4362.615262] audit: type=1400 audit(1596384041.705:290): apparmor="DENIED" operation="symlink" profile="/home/test.sh" name="/home/b.c" pid=8016 comm="ln" requested_mask="c" denied_mask="c" fsuid=0 ouid=0

libraries/libapparmor/testsuite/test_multi/symlink.out

@@ -0,0 +1,15 @@
+START
+File: symlink.in
+Event type: AA_RECORD_DENIED
+Audit ID: 1596384041.705:290
+Operation: symlink
+Mask: c
+Denied Mask: c
+fsuid: 0
+ouid: 0
+Profile: /home/test.sh
+Name: /home/b.c
+Command: ln
+PID: 8016
+Epoch: 1596384041
+Audit subid: 290

libraries/libapparmor/testsuite/test_multi/symlink.profile

@@ -0,0 +1,4 @@
+/home/test.sh {
+  owner /home/b.c w,
+
+}

utils/apparmor/logparser.py

@@ -319,6 +319,7 @@ class ReadLog:
        'rename_dest',
        'unlink',
        'rmdir',
+       'symlink',
        'symlink_create',
        'link',
        'sysctl',