Add zookeeper and interconnect timeout: refs #344

Fix timeout behavior only to use RPC server, so we add
--zookeeper_timeout(-T)/--interconnect_timeout(-I) options
that must be greater than 0.
Add const to argument of push_cleanup
Remove unnecessary variable
Add ZooKeeper and interconnect timeout to jubavisor/jubactl and boot message (refs #344)
Merge pull request #416 from gintenlabo/fix-non-const-argument

The argument of `push_cleanup` should be a const reference
Modify ZooKeeper timeout option (T -> Z)
Merge branch 'feature/fix-timeout' into develop

Add new timeout option to server and keeper: fixes #344
Fix linear_mixer.ticktime status value: fixes #418