Remove insserv from OE-Core. It did have uses but we've optimised the sysvinit
scripts as needed and there are other directions init systems are moving now.
It no longer belongs in the core.
(From OE-Core rev: 9650efb5bb8fc77627dd567e43f8768b34a22abb)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>