PSQLADM-302 - Fixing the Jenkins job for ProxySQL (test-proxysql script) (#893)
PSQLADM-302 - Fixing the Jenkins job for ProxySQL (test-proxysql script) (#893)

* PSQLADM-302 - Fixing the Jenkins job for ProxySQL (test-proxysql script)
- Fixed the test script to work on CentOS
- Fixed the test script to work on Ubuntu/Debian
- Changed the workdir structure where the proxysql-admin test suite will run
- Fixed the issue with localhost mapping in ipv6 enabled machines
Percona-Lab/jenkins-pipelines,Percona-Lab/jenkins-pipelines,Percona-Lab/jenkins-pipelines,Percona-Lab/jenkins-pipelines