Documentation: Wireshark troubleshooting section.
Add Wireshark screenshot. Fix wording in docs.
Merge remote-tracking branch 'zenoss/develop' into develop
Support for sql server failover cluster service instances

The scope of ZEN-12401.
Implemented scripts for getting cluster and local istances.
Used owner node's hostname to get modeling/monitoring data for cluster sql
instances.
Removed commented out code
Used '//' to separate node and server in cluster_node_server property