[RFC PATCH ghak10 v3 0/3] audit: Log modifying adjtimex(2) calls

I tried to implement separate records for each variable as suggested by Richard and it turned out to be quite straightforward and results in more compact and readable records (even though there is now a bit more of them). Changes in v3: - Switched to separate records for each variable - Both old and new value is now reported for each change - Injecting offset is reported via a separate record (since this offset consists of two values and is added directly to the clock, i.e. it doesn't make sense to log old and new value) - Added example records produced by chronyd -q (see the commit message of the last patch) Changes in v2: - The audit_adjtime() function has been modified to only log those fields that contain values that are actually used, resulting in more compact records. - The audit_adjtime() call has been moved to do_adjtimex() in timekeeping.c - Added an additional patch (for review) that simplifies the detection if the syscall is read-only.