[apparmor] patch - change hasher to be easy to debug

[Peter Maloney]

This patch changes the hasher() into a class based nested dict so it is
FAR easier to debug. Also I wrote a __str__() method that prints the
contents nice and pretty.

Using this, I managed to find other problems, possibly the one I was
trying to solve. Here is a snippet of printing out the aa[profile][hat]
which has lots of "include"s that are mixed in by mistake. This patch
does not fix this problem (see next patch in another thread), only
changes the hasher so it is easy to track.

                pm DEBUG: rematchfrag, allow = allow, path =
/etc/bash.bashrc, frag = {
               
                    # this is the junk...
                    abstractions/gnome: {}
                    tunables/kernelvars: {}
                    local/usr.sbin.ntpd: {}
                    abstractions/bash: {}
                    tunables/multiarch: {}
                    tunables/global: {}
                    abstractions/apparmor_api/examine: {}
                    abstractions/private-files: {}
                    abstractions/base: {}
                    abstractions/postfix-common: {}
                    abstractions/mysql: {}
                    [...LOTS more lines...]
                    local/usr.sbin.smbldap-useradd: {}
                   
                    include: { # probably useful
                        abstractions/base: True
                    }
                    allow: { # This part is useful
                        path_regex: {
                            /home/*/tmp/: {
                                audit: set([])
                                mode: set(['r', '::r'])
                            }
                            /usr/share/**/: {
                                audit: set([])
                                mode: set(['r', '::r'])
                            }
                        }                       

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