PMM-3858 Install mysql 5.7.x on AWS staging (#92)
PMM-3858 Install mysql 5.7.x on AWS staging (#92)

* PMM-3858 Install mysql 5.7.x on AWS staging

* PMM-3858 Minor

Percona-Lab/jenkins-pipelines,Percona-Lab/jenkins-pipelines,Percona-Lab/jenkins-pipelines,Percona-Lab/jenkins-pipelines