message: Switch timestamp tooltip to PF4 to prevent overflow clipping
  Partially fixes
diff: import * as React from 'react';
  import { connect } from 'react-redux';
  -import { Tooltip } from './tooltip';
  +import { Tooltip } from '@patternfly/react-core';
  import * as classNames from 'classnames';
  import { GlobeAmericasIcon } from '@patternfly/react-icons';
  @@ -57,7 +57,7 @@ export const Timestamp = connect(nowStateToProps)((props: TimestampProps) => {
  return <div className={classNames('co-timestamp co-icon-and-text', props.className)}>
  <GlobeAmericasIcon className="co-icon-and-text__icon" />
  <Tooltip content={[<span className="co-nowrap" key="co-timestamp">{ mdate.toISOString() }</span>]}>
  - { timestamp }
  + <span>{ timestamp }</span>
  </Tooltip>
  </div>;
  });
  