Adjust default service record TTLs, 120 and 4500 are RFC recommended
Adjust default service record TTLs, 120 and 4500 are RFC recommended

According to RFC6762 section 10:

   As a general rule, the recommended TTL value for Multicast DNS
   resource records with a host name as the resource record's name
   (e.g., A, AAAA, HINFO) or a host name contained within the resource
   record's rdata (e.g., SRV, reverse mapping PTR record) SHOULD be 120
   seconds.

   The recommended TTL value for other Multicast DNS resource records is
   75 minutes.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/mdnsd,troglobit/mdnsd