[INFINITY-2088] De-flake test_secrets.test_secrets_config_update (#1357)
[INFINITY-2088] De-flake test_secrets.test_secrets_config_update (#1357)

* Add retry logic & clean-up naming

* Removed redundant flag & possibly unsafe retry

* Include strip for resiliency

mesosphere/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,mesosphere/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,vishnu2kmohan/dcos-commons,mesosphere/dcos-commons,vishnu2kmohan/dcos-commons