loadedmetadata event not fired until manual play if HLS is a live stream

[dsine-de]

When a HLS .m3u8 playlist is missing the #EXT-X-ENDLIST line (e.g. https://d2zihajmogu5jn.cloudfront.net/pdt-test-source/no-endlist.m3u8), the loadedmetadata event does not fire when the playlist is loaded and the stats are available (e.g. duration etc.) until the user manually starts playback.

Reduced test case: https://codepen.io/phelaz/pen/bNwPeOB

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