[apparmor] [PATCH] add caching tests to build

[Kees Cook]

This adds the caching tests to the build, which requires effectively
reverting revno 1471 and fixes the root-cause (load_policy complaining that
the kernel file descriptor isn't open when kernel_load is false).

This also fixes the caching test to no longer need root (writing a cache
isn't privileged -- just access the kernel is, since the base directory can
be relocated).

Updates the caching test to slow down when on a non-nanosecond resolution
filesystem (the buildds).

Also drops an unused variable from parser_interface.c that was generating
warnings, and adds a cache timestamp debug output.

Probably don't need this for 2.5.1, but it makes testing the other caching
changes easier.

-Kees

-- 
Kees Cook
Ubuntu Security Team
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