(QENG-846) Add timestamp to options hash.

This makes the timestamp available globally during Beaker runs so it can be used
to add files to the specific run's log directory without being confused by other
simultaneous runs of Beaker due to the use of log/latest symlink.

Signed-off-by: Wayne <wayne@puppetlabs.com>
Merge pull request #332 from waynr/feature/QENG-846-add-timestamp-to-options-hash

(QENG-846) Add timestamp to options hash.