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This change syncs external/ppp with upstream. Specifically it's based on
upstream's 6e8eaa7a78b31cdab2edf140a9c8afdb02ffaca5.

In order to do this without blowing away the Android-specific changes, I
ran a script to try and find a matching revision in upstream's git tree
to the initial commit in external/ppp.

Based on the contents of *.c and *.h files in pppd/, upstream's
f8583676904957554c5a8bd14ede415688835f6c matches with the local revision
82c907af.

I diffed upstream's f8583676 with upstream's HEAD and removed chunks
from the result that applied to files that aren't present in Android. In
some places, the diff didn't apply cleanly because of Android-specific
changes:

  1) Local change 8ad0dd2a added two "return UPAP_AUTHNAK;" statements
     in "#if 1" blocks in auth.c. They have been reflected into
     session.c/session_start by always returning SESSION_FAILED.
     (Additionally, new code to query the local password db has been
     disabled via #if !defined(__ANDROID__).)

  2) Upstream now always defines INET6 for Linux so I've pulled IPv6
     support in. (Otherwise sys-linux.c has compile errors.)

  3) linux/ipv6_route.h needed to be included explicitly.

  4) I defined HAVE_LOGWTMP to avoid calling some wtmp functions that
     aren't implemented in Android. A dummy logwtmp is defined.

All the above changes are in __ANDROID__ tags to highlight them.
Additionally I've ensured that all the pre-existing changes are also now
in __ANDROID__ tags.

Change-Id: Ia5abe677d6ba4d5e9f4fbcd4fa03d8911b8bed12

Bug: 11559337

(cherry picked from commit 5e0738a2)

Change-Id: I7a25195e22b3b244e75c9f615c1233e34d92dc4d

Bug: 11559337
Change-Id: Id94bdc78a523067e9cd214b255c6cc3f333adaa3

Change-Id: Iaf128867dd892b6756d4d0523c97caadf67d0e0f

Bug: 8580410
Change-Id: I89a92f329d721a07a2ae1410b4b86894d4eb9537

Android already has a version of strlcat / strlcpy. There's
no need for pppd to duplicate it.

Change-Id: Ie094cccc2d2b8553cf3c6629c6a79bf3b8db9d06

Android already has a version of strlcat / strlcpy. There's
no need for pppd to duplicate it.

Change-Id: Ie094cccc2d2b8553cf3c6629c6a79bf3b8db9d06

Change-Id: I2e991872e297363d2e0a08e92d7fcebdea96a472

Add NOTICE file for ip-up-vpn.
Remove GPLed code from pppd (wasn't being compiled in), and
fix up pppd/NOTICE to reflect.

Change-Id: I44b7b2680f65013f96f0043e40e8deeebabe2ec4

Change-Id: Iede478bc19d5979417492d172288e6b1267ca5f1

This fixes running ppp through adb as sockets, that are connected
to a pipe with the help of nc. Further, the path construction now
corresponds to other versions of pppd.

Change-Id: Ib810dc69cbdf08b58cde65210b31cd7bd1427721

Bug: 2325838
Change-Id: I2e1df5a71aead40063f82cc0dda222f370ad4043

It is safe because it will not work without proper capabilities.
Allowing privileged options is also safe for the same reason.

1. Remove TARGET_OUT_OPTIONAL_EXECUTABLES from Android.mk
   since pppd is now required by VPN, no longer optinoal.
2. Avoid creating pid files.
3. Use linkname as a suffix of program names which allows
   different users to run different set of scripts. E.g.
   if linkname is "vpn", "/etc/ppp/ip-up-vpn" is executed.

1. Undo some changes about running scripts.
2. Move android logging from logit() to log_write().
3. Remove all syslog() related calls.

which __android_log_vprint() does not understand.

   will make all terminal-specific options unrecognized. (see tty.c)
2. Remove libssl and ipxcp.c from Android.mk. We do not need them.

It includes:
  1. Enable the CHAPMS authentication for talking to MS vpn server.
  2. Reuse the message digest/hashing functions in openssl instead of
     the md4, md5 and sha1 functions in the package to save the space.
  3. Enable the execution the ip-up/ip-down script on Android.

Update: add comment and replace tab with spaces.