Revert "handle IPv6 host (#614)" (#617)

This reverts commit ca4eb72.

Author: estolfo

elasticsearch-transport/lib/elasticsearch/transport/client.rb

@@ -201,10 +201,6 @@ def __parse_host(host)
               :host => uri.host,
               :path => uri.path,
               :port => uri.port }
-          elsif host =~ /^\[[a-z0-9:]+\]:[0-9]+/
-            host, sep, port = host.rpartition(':')
-            {:host => host,
-             :port => port}
           else
             host, port = host.split(':')
             { :host => host,

elasticsearch-transport/spec/elasticsearch/transport/client_spec.rb

@@ -126,19 +126,6 @@
         expect(hosts[0][:port]).to be(9200)
       end
 
-      context 'when ipv6 is specified' do
-
-        let(:host) do
-          '[fd95:ff55:7fb8:f1e5:f816:3eff:feed:ce5b]:9200'
-        end
-
-        it 'extracts the host' do
-          expect(hosts[0][:host]).to eq('[fd95:ff55:7fb8:f1e5:f816:3eff:feed:ce5b]')
-          expect(hosts[0][:scheme]).to eq('http')
-          expect(hosts[0][:port]).to be(9200)
-        end
-      end
-
       context 'when a path is specified' do
 
         let(:host) do