fix apache2 configuration after php upgrade to php7

Hello, I have a personal server (hosted in AWS E2C) which I recently upgraded and then the pages associated to my domains stopped working. PHP downloads a file instead of executing it. I think it has to be something simple, and would pay to learn what is the mistake. I will provide the private key to connect to my server via SSH. Keywords: linux, aws, e2c, apache2, php7, webmin