proc: modernize proc to support multiple private instances Eric W. Biederman [3] [4] * After a discussion with Eric W. Biederman, the numerical values for hidepid * Rebase on top of Eric W. Biederman's procfs changes. ...option removed as suggested by Eric W. Biederman. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>