Update snmpd.init

add support for "disk <partition> <size>" option

example for /etc/config/snmpd
===========
config disk
	option partition	'/'
	option size		'500'
===========
postfix 2.11.3

Signed-off-by: Denis Shulyaka <Shulyaka@gmail.com>
Merge pull request #471 from Shulyaka/master

postfix: version update to 2.11.3
ocserv: updated to 0.8.7

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Merge pull request #422 from rcmcronny/patch-1

Update snmpd.init - add support for disk config option