UDP monitor changes

1. added events for database/sphinx write
2. added event for api end with the execution time
3. added the client tag to the api start event
4. reduce packet size by shortening field names
5. initialize the partner id for requests with nocache=1
UDP monitor updates

1. added a CLI client for the monitor
2. changed the field letters so that commonly used fields will have easy
to remember names
3. separate the event types of sphinx and database
fixed a comment
Merge pull request #383 from kaltura/IX-9.4.0-add-monitoring-events

UDP monitor changes