v2.38.rc15

• FEC-4484 - Improve Native Callout
• FEC-4521 - webcast with no DVR - after stop start of the video the player is freeze.
• FEC-4519 - Kaltura Live isn't starting to play after stop and re-run the stream
• OSMF-HLS plugin (2.37 + id3Tags support).
  The Massive-Buffers-Refactor code has been rolled back