kamailio-4.1.x: update to 4.1.5

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
kamailio-4.1.x: add module rtpproxy-ng and cnxcc

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
kamailio-4.1.x: add mysql and stun module

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
yate: add mysql module

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
asterisk-1.8.x: add mysql module

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
asterisk-11.x: add mysql module

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>
restund: enable mysql module

Signed-off-by: Jiri Slachta <slachta@cesnet.cz>