#1654 [HHQ-2152] Allow script plugins to return strings and displa

[Hyperic Team]

http://jira.hyperic.com/browse/HHQ-2152
When using a Script Plugin, the underlying script often checks multiple conditions but is only able to return one set of numeric values. Allowing the script to return a short string that gives some context to the condition checked, or in the case of an error, a specific reason for the error, would be a useful addition. The string should be accessible for use in Alerts and visible when viewing via the UI or email.