Skip spec that requires network access.

Index: spec/ruby/library/socket/tcpsocket/shared/new.rb
--- spec/ruby/library/socket/tcpsocket/shared/new.rb.orig
+++ spec/ruby/library/socket/tcpsocket/shared/new.rb
@@ -15,6 +15,7 @@ describe :tcpsocket_new, shared: true do
   end
 
   it 'raises IO::TimeoutError with :connect_timeout when no server is listening on the given address' do
+    skip
     -> {
       TCPSocket.send(@method, "192.0.2.1", 80, connect_timeout: 0)
     }.should raise_error(IO::TimeoutError)
