umdns: update to the version 2017-05-22

umdns: update to the version 2017-05-22

This includes following changes:
0e8b948 Support specifying instance name in JSON file
49fdb9f Support PTR queries for a specific service
26ce7dc Allow filtering with instance name in service_reply
920c62a Store instance name in the struct service
ff09d9a Rename service_name function to the service_instance_name
64f78f1 Rename mdns_hostname variable to the umdns_host_label

Previous package update pulled commit 70c66fbbcde86 ("Fix sending
replies to PTR questions") which introduced a regression which this
update fixes.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>