[JIRA] (OVIRT-913) Speed up mock with the `nosync` package

Speed up mock with the `nosync` package --------------------------------------- Key: OVIRT-913 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-913 Project: oVirt - virtualization made easy Issue Type: Improvement Components: Jenkins Reporter: Barak Korren Assignee: Barak Korren Labels: mock, mock_runner.sh, standard-ci The {{nosync}} package can make mock faster by making it ignore all {{sync(2)}} calls. {{mock_runner.sh}} actually already enables this setting in the chroot configuration files, but it cannot work without the package. We need to check if this actually makes mock faster, and if so, add it to the slaves.