Introduce boolean nostream parameter to StatsCmd. (#1287)

* BUG-1278: Introduce boolean nostream parameter to StatsCmd.

* BUG-1278: Fix review. User try-with-resources. Remove sleep. Use null-safe check.

* BUG-1278: Fix review. Removed useless assertions and logs. Fix namings. Fix container names. Revert encodings.xml.

* BUG-1278: Remove not used imports.

Fixes #1278