DM-1152 - zookeeper connection - proper/robust implementation

It is a combination of 4 commits.
See branch u/jbecla/DM-1152 for full details
Merge branch 'u/jbecla/DM-1152'
DM-518: improved CSS exceptions. Small bug fixes.

* Removed unnenecessary exception translation in CSS.
* Fixed bug: same db name passed to createDbLike() was causing the function to deadlock.
* Fixed ifdef names