Return void when ISC_R_SUCCESS is only returned value

With isc_mem_get() and dns_name_dup() no longer being able to fail, some functions can now only return ISC_R_SUCCESS. Change the return type to void for the following function(s):

• dns_catz_options_copy()
• dns_catz_options_setdefault()
• dns_catz_entry_new()
• dns_catz_entry_copy()
• build_event()
• name_duporclone()
• dns_resolver_addalternate()
• dns_ssutable_addrule()
• dns_ssutable_create()
• dns_ssutable_createdlz()
• dns_view_adddelegationonly()
• dns_view_excludedelegationonly()
• dns_zone_setprimaries()
• dns_zone_setparentals()
• dns_zone_setparentals()
• dns_zone_setalsonotify()

Closes #1432 (closed)