lsb: update init-functions and remove sendmail

According to LSB specification Ref1, LSB checks file
/lib/lsb/init-functions. But for 64 bits system it is installed in
/lib64. Install init-functions to /lib/lsb to conform with LSB
specification.

Link file /usr/lib/sendmail which points to /usr/sbin/sendmail is
required by LSB according to Linux FHS[Ref 2]. But it should be done by
packages which provides command sendmail such as msmtp, postfix and
esmtp etc.

Refs:
1 http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptfunc.html
2 http://www.pathname.com/fhs/pub/fhs-2.3.html#SPECIFICOPTIONS13



Signed-off-by: Kai Kang <kai.kang@windriver.com>