asterisk-11.x: update to 11.2.1

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
asterisk-chan-sccp-b: update to revision 5746

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
kamailio-4.1.x: update to 4.1.6

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
Merge branch 'master' of http://git.openwrt.org/feed/telephony