Leaking-addresses patches for 4.17-rc1

Here is the patch set for the 4.17-rc1 merge window.  This set
represents improvements to the scripts/leaking_addresses.pl script.  The
major improvement is that with this set applied the script actually runs
in a reasonable amount of time (less than a minute on a standard stock
Ubuntu user desktop).  Also, we have a second maintainer now and a tree
hosted on kernel.org

We do a few code clean ups.  We fix the command help output.  Handling
of the vsyscall address range is fixed to check the whole range instead
of just the start/end addresses.  We add support for 5 page table levels
(suggested on LKML).  We use a system command to get the machine
architecture instead of using Perl.  Calling this command for every
regex comparison is what previously choked the script, caching the
result of this call gave the major speed improvement.  We add support
for scanning 32-bit kernels using the user/kernel memory split.  Path
skipping code refactored and simplified (meaning easier script
configuration).  We remove version numbering.  We add a variable name to
improve readability of a regex and finally we check filenames for
leaking addresses.

Currently script scans /proc/PID for all PID.  With this set applied we
only scan for PID==1. It was observed that on an idle system files under
/proc/PID are predominantly the same for all processes.  Also it was
noted that the script does not scan _all_ the kernel since it only scans
active processes.  Scanning only for PID==1 makes explicit the inherent
flaw in the script that the scan is only partial and also speeds things up.

Signed-off-by: Tobin C. Harding <me@tobin.cc>
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