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Merge commit 'a4d7bac2'

* commit 'a4d7bac2':
  Remove the eng tag, the VPN will need pppd in user build.

Merge commit '673ef9b9'

* commit '673ef9b9':
  Bind the logging to logit() since pppd uses special expressions such as "%I"

Merge commit 'a263473d'

* commit 'a263473d':
  1. Add a new option 'pppox <n>' to support PPPoX sockets. Note that using this

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.

Merge commit 'e7f221f1'

* commit 'e7f221f1':
  This change is for enabling the pppd for vpn authentication and setup.

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.