On Webex failures (garbled audio, silence, black frame), the invalid
asset/filesync shoudl be removed/rolled-back in order to enable the
retry procedure to use the original ARF source, rather than the invalid
WMV inter-src.
Added 'previousVersion' field.
Set before in 'incrementVersion'.

First use in Webex failure inter-src rollback
Merge pull request #1946 from kaltura/Jupiter-10.0.0-SUP-2810-ARF-garbled-audio-refix

Jupiter 10.0.0 sup 2810 arf garbled audio refix