Updated support in sphinx sticky session.
In case a flag - 'sessionKey' is passed within the KS priveleges, it
will be used (concatenated with the partner id) as the sticky session
key.
#time 30m #plat-799
Sphinx sticky - make it prettier.
#time 5m
Unrelated commit
Merge pull request #722 from kaltura/IX-9.9.0-sticky-sphinx

Updated support in sphinx sticky session.