openssh: upgrade to 6.7p1

openssh: upgrade to 6.7p1

* Drop two CVE patches already handled upstream.
* Drop nostrip.patch which no longer applies and use the existing
  --disable-strip configure option instead.
* OpenSSH 6.7+ no longer supports tcp wrappers. We could apply the
  Debian patch to add support back in, but it seems best to follow
  upstream here unless we have a good reason to do otherwise.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>