tests, no every adapter supports "connection.version"

This solves the following issue:

```
$ bin/test
Using sqlite3
/Users/senny/Projects/rails/activerecord/test/cases/adapters/mysql2/sp_test.rb:16:in `<class:Mysql2StoredProcedureTest>': undefined method `version' for #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0x007f8bab4b5b70> (NoMethodError)
	from /Users/senny/Projects/rails/activerecord/test/cases/adapters/mysql2/sp_test.rb:5:in `<top (required)>'
	from /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:302:in `require'
	from /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:302:in `block in require'
	from /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:268:in `load_dependency'
	from /Users/senny/Projects/rails/activesupport/lib/active_support/dependencies.rb:302:in `require'
	from /Users/senny/Projects/rails/railties/lib/rails/test_unit/test_requirer.rb:11:in `block in require_files'
	from /Users/senny/Projects/rails/railties/lib/rails/test_unit/test_requirer.rb:10:in `each'
	from /Users/senny/Projects/rails/railties/lib/rails/test_unit/test_requirer.rb:10:in `require_files'
	from /Users/senny/Projects/rails/railties/lib/rails/test_unit/minitest_plugin.rb:69:in `plugin_rails_init'
	from /Users/senny/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/minitest-5.3.3/lib/minitest.rb:73:in `block in init_plugins'
	from /Users/senny/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/minitest-5.3.3/lib/minitest.rb:71:in `each'
	from /Users/senny/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/minitest-5.3.3/lib/minitest.rb:71:in `init_plugins'
	from /Users/senny/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/minitest-5.3.3/lib/minitest.rb:122:in `run'
	from bin/test:19:in `<main>'
```

1 files changed, 12 insertions, 11 deletions

diff --git a/activerecord/test/cases/adapters/mysql2/sp_test.rb b/activerecord/test/cases/adapters/mysql2/sp_test.rb
index 8b12945f24..cdaa2cca44 100644
--- a/activerecord/test/cases/adapters/mysql2/sp_test.rb
+++ b/activerecord/test/cases/adapters/mysql2/sp_test.rb
@@ -7,23 +7,24 @@ class Mysql2StoredProcedureTest < ActiveRecord::Mysql2TestCase
 
   def setup
     @connection = ActiveRecord::Base.connection
+    unless ActiveRecord::Base.connection.version >= '5.6.0'
+      skip("no stored procedure support")
+    end
   end
 
   # Test that MySQL allows multiple results for stored procedures
   #
   # In MySQL 5.6, CLIENT_MULTI_RESULTS is enabled by default.
   # http://dev.mysql.com/doc/refman/5.6/en/call.html
-  if ActiveRecord::Base.connection.version >= '5.6.0'
-    def test_multi_results
-      rows = @connection.select_rows('CALL ten();')
-      assert_equal 10, rows[0][0].to_i, "ten() did not return 10 as expected: #{rows.inspect}"
-      assert @connection.active?, "Bad connection use by 'Mysql2Adapter.select_rows'"
-    end
+  def test_multi_results
+    rows = @connection.select_rows('CALL ten();')
+    assert_equal 10, rows[0][0].to_i, "ten() did not return 10 as expected: #{rows.inspect}"
+    assert @connection.active?, "Bad connection use by 'Mysql2Adapter.select_rows'"
+  end
 
-    def test_multi_results_from_find_by_sql
-      topics = Topic.find_by_sql 'CALL topics(3);'
-      assert_equal 3, topics.size
-      assert @connection.active?, "Bad connection use by 'Mysql2Adapter.select'"
-    end
+  def test_multi_results_from_find_by_sql
+    topics = Topic.find_by_sql 'CALL topics(3);'
+    assert_equal 3, topics.size
+    assert @connection.active?, "Bad connection use by 'Mysql2Adapter.select'"
   end
 end