Changing MYSQL_HOST -> MYSQL_SOCKET
Changing MYSQL_HOST -> MYSQL_SOCKET

remi/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,remi/getting-started-ruby,GoogleCloudPlatform/getting-started-ruby,remi/getting-started-ruby,remi/getting-started-ruby