code review changes to cluster monitors
Merge branch 'master' of https://github.com/apache/stratos into master-cluster-monitors
Merge branch 'master' of https://github.com/apache/stratos into master-cluster-monitors
using executor instead of nornal threads
executor service instead of thread sleep
Merge branch 'master' of https://github.com/apache/stratos into master-cluster-monitors
Merge branch 'master' of https://github.com/apache/stratos into master-cluster-monitors. This closes #79