Fix Issue #3083 for live streams with multiperiod.
requested to merge github/fork/Orange-OpenSource/ISSUE_#3083_Regressions_in_3.0.0_live into development
Created by: jeremco
Hi
This PR solves the issue #3083 (closed). The pb was that introduced function in 3.0.0, SegmentUtils::isSegmentAvailable was returning false in case of multiperiod streams if segment time was not found in current period. For live streams, play was never started, because no request was available at startTime
Jérémie