merge revision(s) r44884: [Backport #9498]

	* lib/resolv.rb (Resolv::DNS::Message::MessageDecoder): Raise
	  DecodeError if no data before the limit.
	  Reported by Will Bryant.  [ruby-core:60557] [Bug #9498]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@44976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) r44880: [Backport #9477]

	* lib/resolv.rb: Ignore name servers which cause EAFNOSUPPORT on
	  socket creation.
	  Reported by Bjoern Rennhak.  [ruby-core:60442] [Bug #9477]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@44977 b2dd03c8-39d4-4d8f-98ff-823fe69b080e