Fix IP version field and hop limit in keyed IPv6 tunnel app

The IP version field was set incorrectly.

The default hop limit was changed from 0 to 64 and made configurable.
Update authorized_keys
Add SysV init scripts


NOTE: completely untested!!!

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
makefile: install targets

All targest will be installed relevant to PREFIX env variable.
Add 2 new targets:

 - install_db_node
 - install_compute_node

Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Added signatures of sleep(3), alarm(3) and ualarm(3) to
src/core/clib.sh .
Added module lib.watchdog.watchdog .
Adjusted src/Makefile to run **/selftest.sh scripts.
Merge pull request #228 from virtualopensystems/sysv

SysV init scripts
[lib.watchdog.watchdog] Fixed a comment.
Removed .travis.yml .
Merge pull request #236 from eugeneia/disable_travis

Disable Travis
[cperf] Added continuous benchmarking facility `cperf'.
[snabb_bot] Added SnabbBot implementation.
[SnabbBot] Post GitHub `commit status' instead of comment.
Merge pull request #235 from eugeneia/snabb_bot

snabb_bot and cperf: Continuous integration and benchmarking.
Merge pull request #232 from eugeneia/watchdog

Added watchdog module.
Merge pull request #226 from korczis/patch-1

Update authorized_keys
Merge pull request #223 from alexandergall/keyed-ipv6-tunnel-fix

Fix IP version field and hop limit in keyed IPv6 tunnel app