update logstash filters for cloudwatch logs to drop unnecessary tags

[markdboyd]

Changes proposed in this pull request:

• Drop tag values that are not useful for customers. The PlanGUID value is not actually the value of a CF service plan and the ServiceGUID value is not actually the GUID of a service offering

Things to check

• For any logging statements, is there any chance that they could be logging sensitive data?
• Are log statements using a logging library with a logging level set? Setting a logging level means that log statements "below" that level will not be written to the output. For example, if the logging level is set to INFO and debugging statements are written with log.debug or similar, then they won't be written to the otput, which can prevent unintentional leaks of sensitive data.

Security considerations

None

[JasonTheMain]

Looks good to me