r3117, r3123, r3229 merge:

server name related merges:

*) If .domain.com, .sub.domain.com, and .domain-some.com were defined,
   then .sub.domain.com was matched by .domain.com: wildcard names hash
   was built incorrectly due to sorting order issue of "." vs "-".
   They were sorted as
       com.domain  com.domain-some  com.domain.sub
   while they should be sorted as
       com.domain  com.domain.sub   com.domain-some
   for correct hash building

*) test space between "~" and regex in server_name and invalid_referers

*) do not run regex for empty host name since regex always fails in this case,
   the bug had been introduced in r2196

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