netfilter: xt_qtaguid: report only uid tags to non-privileged processes

In the past, a process could only see its own stats (uid-based summary,
and details).
Now we allow any process to see other UIDs uid-based stats, but still
hide the detailed stats.

Change-Id: I24fb841fe36f11b10f16ec61f90aded51b59911c
Signed-off-by: JP Abgrall <jpa@google.com>
Git-commit: c33bcd377203feb708cb02673731e70c14ef8c91
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Srinivasarao P <spathi@codeaurora.org>