[DP-100] Implement monitoring for registry values

[qnikst]

[Imported from JIRA. Reported by Alexander Vershilov @qnikst) as DP-100 on 2015-01-30 12:04:08]
Currently it's possible to store remote processes in registry, but such processes are not guaranteed to be monitored. So when remote process dies current node will never receive an event about process death so will never free value from registry and this could potentialy lead to memory leaks.

We need to elaborate a good solution for this issue.

[qnikst]

Addressed in PR #184.