apparmor: validate generated profiles with apparmor_parser

[thaJeztah]

Add a helper that parses generated profiles with apparmor_parser without loading them into the kernel, and use it for golden profile tests where the referenced includes are available.

This gives the tests an additional syntax/validation check beyond comparing the generated output with golden files.

[thaJeztah]

This fails when adding this test-case;

		{
			name: "with-special-characters",
			data: profileData{
				Name: `foo"bar`,
			},
		},

=== RUN   TestGenerateDefault/with-special-characters/validate
    apparmor_linux_test.go:312: parsing generated profile: exit status 1
        Cache read/write disabled: interface file missing. (Kernel needs AppArmor 2.4 compatibility patch.)
        AppArmor parser error at line 6: Lexer found unexpected character: '"' (0x22) in state: INITIAL

[thaJeztah]

cc @vvoland ptal