net-snmp: add SNMPv3 options

This commit implements SNMPv3 functionality
to snmpd.init.
In particular it adds function snmpd_snmpdv3_add,
which sets the needed options in /var/run/snmpd.conf.
Additionally a possibility to download mib file
is also added.

Signed-off-by: Christian Korber <ckorber@tdt.de>

net/net-snmp/files/snmpd.init

@@ -379,6 +379,7 @@ start_service() {
 	append_authtrapenable authtrapenable enable authtrapenable
 	append_parm v1trapaddress host v1trapaddress
 	append_parm trapsess trapsess trapsess
+	config_foreach snmpd_snmpv3_add v3 general
 
 	procd_set_param command $PROG -Lf /dev/null -f -r
 	procd_set_param file $CONFIGFILE