Trilogy is much slower than mysql2 to connect to an IP

```
$ script/benchmark-connect
Warming up --------------------------------------
trilogy connect/close
                       107.000  i/100ms
mysql2 connect/close   761.000  i/100ms
Calculating -------------------------------------
trilogy connect/close
                          1.022k (±73.3%) i/s -    321.000  in  19.716812s
mysql2 connect/close      7.564k (±19.0%) i/s -     37.289k in   5.246187s

Comparison:
mysql2 connect/close:     7564.4 i/s
trilogy connect/close:     1022.4 i/s - 7.40x  slower
```

contrib/ruby/script/benchmark-connect

@@ -0,0 +1,161 @@
+#!/usr/bin/env ruby
+
+require "rubygems" if !defined?(Gem)
+require "bundler/setup"
+
+require "benchmark/ips"
+require "trilogy"
+require "mysql2"
+
+DEFAULT_USER = ENV["MYSQL_USER"] || "root"
+DEFAULT_PASS = ENV["MYSQL_PASS"]
+DEFAULT_SOCK = ENV["MYSQL_SOCK"] || "/tmp/mysql.sock"
+
+connect_options = {
+  path:     DEFAULT_SOCK, # for trilogy
+  socket:   DEFAULT_SOCK, # for mysql2
+  username: DEFAULT_USER,
+  password: DEFAULT_PASS,
+  host: "localhost",
+}
+
+Benchmark.ips do |x|
+  x.report "trilogy connect/close" do
+    client = Trilogy.new(connect_options)
+    client.close
+  end
+
+  x.report "mysql2 connect/close" do
+    client = Mysql2::Client.new(connect_options)
+    client.close
+  end
+
+  x.compare!
+end
+
+# trilogy_client = Trilogy.new(connect_options)
+# mysql2_client = Mysql2::Client.new(connect_options)
+#
+# ESCAPE_STR = "abc\\'def\\\"ghi\\0jkl%mno"
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy escape" do
+#     trilogy_client.escape ESCAPE_STR
+#   end
+#
+#   x.report "mysql2 escape" do
+#     mysql2_client.escape ESCAPE_STR
+#   end
+#
+#   x.compare!
+# end
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy ping" do
+#     trilogy_client.ping
+#   end
+#
+#   x.report "mysql2 ping" do
+#     mysql2_client.ping
+#   end
+#
+#   x.compare!
+# end
+#
+# TEST_DB = "test"
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy change_db" do
+#     trilogy_client.change_db TEST_DB
+#   end
+#
+#   x.report "mysql2 change_db" do
+#     mysql2_client.select_db TEST_DB
+#   end
+#
+#   x.compare!
+# end
+#
+# QUERY = "SELECT 1"
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy query" do
+#     trilogy_client.query QUERY
+#   end
+#
+#   x.report "trilogy query (no-casting)" do
+#     trilogy_client.query_flags &= ~Trilogy::QUERY_FLAGS_CAST
+#     result = trilogy_client.query QUERY
+#     result.to_a
+#   end
+#
+#   x.report "mysql2 query" do
+#     result = mysql2_client.query QUERY
+#     result.to_a
+#   end
+#
+#   x.report "mysql2 query (no-casting)" do
+#     result = mysql2_client.query QUERY, cast: false
+#     result.to_a
+#   end
+#
+#   x.report "mysql2 query (stream)" do
+#     result = mysql2_client.query QUERY, stream: true, cache_rows: false
+#     result.to_a
+#   end
+#
+#   x.report "mysql2 query (stream + no-casting)" do
+#     result = mysql2_client.query QUERY, stream: true, cache_rows: false
+#     result.to_a
+#   end
+#
+#   x.compare!
+# end
+#
+# # affect some rows
+# trilogy_client.query("INSERT INTO trilogy_test (varchar_test) VALUES ('a')")
+# mysql2_client.query("INSERT INTO trilogy_test (varchar_test) VALUES ('a')")
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy affected_rows" do
+#     trilogy_client.affected_rows
+#   end
+#
+#   x.report "mysql2 affected_rows" do
+#     mysql2_client.affected_rows
+#   end
+#
+#   x.compare!
+# end
+#
+# # reset warning count
+# trilogy_client.query("SELECT 1")
+# mysql2_client.query("SELECT 1").to_a
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy warning_count" do
+#     trilogy_client.warning_count
+#   end
+#
+#   x.report "mysql2 warning_count" do
+#     mysql2_client.warning_count
+#   end
+#
+#   x.compare!
+# end
+#
+# # setup an insert id
+# trilogy_client.query("INSERT INTO trilogy_test (varchar_test) VALUES ('a')")
+# mysql2_client.query("INSERT INTO trilogy_test (varchar_test) VALUES ('a')")
+#
+# Benchmark.ips do |x|
+#   x.report "trilogy last_insert_id" do
+#     trilogy_client.last_insert_id
+#   end
+#
+#   x.report "mysql2 last_insert_id" do
+#     mysql2_client.last_id
+#   end
+#
+#   x.compare!
+# end