base-files: remove function service_kill

Function service_kill is deprecated and has no user, so remove it.

Signed-off-by: Zhao, Gang <gamerh2o@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40912 3c298f89-4303-0410-b956-a3cf2f4a3e73

[package] base-files: fix whitespaces

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39006 3c298f89-4303-0410-b956-a3cf2f4a3e73

base-files: split service related functions off to /lib/functions/service.sh

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31042 3c298f89-4303-0410-b956-a3cf2f4a3e73