[PATCH] file capabilities: add no_file_caps switch (v4)

[Serge E. Hallyn]

Hi James, do you mind adding this to the security-testing tree?

(It needs the recent file-caps-always-start-with-clear-bprm-caps patch
which is upstream but not in security-testing:next - if it's more
convenient for you I can resend that)

thanks,
-serge