ntp: Update version from 4.2.8 to 4.2.8p8

Update to the latest point release [1][2].

> (4.2.8p8) 2016/06/02 Released by Harlan Stenn <stenn@ntp.org>
>
> * [Sec 3042] Broadcast Interleave.  HStenn.
> * [Sec 3043] Autokey association reset.  perlinger@ntp.org, stenn@ntp.org
>   - validate origin timestamps on bad MACs, too.  stenn@ntp.org
> * [Sec 3044] Spoofed server packets are partially processed.  HStenn.
> * [Sec 3045] Bad authentication demobilizes ephemeral associations. JPerlinger.
> * [Sec 3046] CRYPTO_NAK crash.  stenn@ntp.org
> * [Bug 3038] NTP fails to build in VS2015. perlinger@ntp.org
>   - provide build environment
>   - 'wint_t' and 'struct timespec' defined by VS2015
>   - fixed print()/scanf() format issues
> * [Bug 3052] Add a .gitignore file.  Edmund Wong.
> * [Bug 3054] miscopt.html documents the allan intercept in seconds. SWhite.
> * [Bug 3058] fetch_timestamp() mishandles 64-bit alignment. Brian Utterback,
>   JPerlinger, HStenn.
> * Update the NEWS file for 4.2.8p8.  HStenn.
> * Fix typo in ntp-wait and plot_summary.  HStenn.
> * Make sure we have an "author" file for git imports.  HStenn.
> * Update the sntp problem tests for MacOS.  HStenn.

Noteworthy in 4.2.8p7:

> * [Bug 2879] Improve NTP security against timing attacks. perlinger@ntp.org
>   - integrated patches by Loganaden Velvidron <logan@ntp.org>
>     with some modifications & unit tests

[1] http://www.linuxfromscratch.org/blfs/view/7.10/basicnet/ntp.html
[2] https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ChangeLog-stable

ntp.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION ntp-4.2.8-0
+# BEE_VERSION ntp-4.2.8p8-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)