Detect endless #include loop when parsing profiles

If an include file includes itsself (for example if local/foo has
'#include <local/foo>'), print a warning instead of calling
load_include() again and again.

This fixes a crash when hitting such a case:
    RecursionError: maximum recursion depth exceeded while calling a Python object

Fixes: https://bugzilla.suse.com/show_bug.cgi?id=1184779 for the tools.
The parser will also need a fix.

utils/apparmor/aa.py

@@ -1855,6 +1855,10 @@ def parse_profile_data(data, file, do_include, in_preamble):
 
             if rule_name == 'inc_ie':
                 for incname in rule_obj.get_full_paths(profile_dir):
+                    if incname == file:
+                        # warn about endless loop, and don't call load_include() (again) for this file
+                        aaui.UI_Important(_('WARNING: endless loop detected: file %s includes itsself' % incname))
+                    else:
                         load_include(incname, in_preamble)
 
         elif RE_PROFILE_START.search(line):  # Starting line of a profile