rend_parse_v2_service_descriptor checks wrong length

2011-03-13 23:45 last one. rend_parse_v2_service_descriptor() by design allows several descs in the string. REND_DESC_MAX_SIZE limiting all of them not one. 2011-03-13 23:47 what for parser wait for "\nrendezvous-service-descriptor " if 20kb is limit for string.

(split from legacy/trac#2750 (moved))