ntp/chrony remove server remediations and test scenarios

[mildas]

Description:

chronyd_specify_remote_server
Update platform to multi_platform_rhel and remove unnecessary empty lines from tests

ntpd_specify_remote_server
Add remediations and test scenarios that are basically same as for chronyd_specify_remote_server. Remediations use same remote server variable as chronyd - var_multiple_time_servers

[mildas]

Updated ntpd test scenarios platform to RHEL 7, because ntp package is not available in RHEL8 and Fedora 33.

[jan-cerny]

Updated ntpd test scenarios platform to RHEL 7, because ntp package is not available in RHEL8 and Fedora 33.

If the ntp package isn't available on some systems, then we most likely should limit the platform of rule ntpd_specify_remote_server in rule.yml to only the systems where this package is available.

[openshift-ci]

@mildas: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-rhcos4-e8	67063f1	link	true	/test e2e-aws-rhcos4-e8
ci/prow/e2e-aws-rhcos4-moderate	67063f1	link	true	/test e2e-aws-rhcos4-moderate

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.