From: John Johansen <john.johansen@canonical.com>

let allow be used as a prefix in place of deny.  Allow is the default
and is implicit so it is not needed but some user keep tripping over
it, and it makes the language more symmetric

   eg.
      /foo rw,
      allow /foo rw,
      deny /foo rw,

Patch history:
  v1: - initial revision

  v2: - rename yacc target rule from opt_deny to opt_perm_mode to
reflect
        that it can be either an allow or deny modifier
      - break apart tests into more digestible chunks and to clarify
        their purpose
      - fix some tests to exercise 'audit allow'
      - add negative tests for 'allow' and 'deny' in the same rule
      - add support for 'allow' keyword to apparmor.vim
      - fix a bug in apparmor.vim to let it recognize multiple
        capability entries in a single line.

  v3: - add support for optional keywords on capability rules in
        regression tests, as well as the bare capability keyword (via
        'cap:ALL')
      - add allow, deny, and conflicting capability behavioral
        regression tests
      - fix vim syntax modeline to refer to apparmor in parser tests
      - adjust FILE regex in vim syntax file creator script

Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Steve Beattie <steve@nxnw.org>
Acked-by: Seth Arnold <seth.arnold@canonical.com>