Revert "made CountMetric and MultiCountMetric serializable"

This reverts commit 3e29f13e405c0d3460781f8f6b310092d332903a.

backwards incompatible change reverted, this is moved to
0.9.0-experimental
Merge branch 'master' into 0.9.0
bump  "0.9.0-wip16"
Added SystemBolt.
SystemBolt has one executor per worker always. It's perfect for
exporting worker related metrics data.
this section of code was moved to new PR
removed topology level stat
removed topologyPartialUptimeSecs
fix conflict