add support for getting the file path from serveFlavor

required for on-the-fly hls segmentation
pathOnly change bug fix

should pass strict=false to getReadyFileSyncForKey so that if the file
sync is not found locally an empty path will be returned instead of error
500
generic hls - add support for playManifest redirect

the playManifest redirect is in order to make the playManifest request
share the same domain with the flavor m3u8s and ts segments for token
cookies
add support for akamai cookie token
Merge pull request #1533 from kaltura/IX-9.19.1-origin-hls-support

Ix 9.19.1 origin hls support