add MongoDB plugin

[jipperinbham]

This PR contains a few additional changes along with a MongoDB plugin:

• testutil.Accumulator was using a Value and Values field and was using a specific one depending on whether the operation was Add vs AddValuesWithTime, this was causing tests that used AddValuesWithTime to not function properly so I removed Value and reworked how the Add function worked to be more inline with the actual Accumulator implementation.
• I copied over stat_types.go from MongoDB Inc's mongo-tools project but removed any code that was requiring another dependency in that project as well as removed any unused code. That project is licensed under Apache V2 so I made note of the origination of work and any modifications in the file.

[otoolep]

Where is serv used in the function launched by the goroutine?

[jipperinbham]

Good catch, it's not needed for the go routine

[jipperinbham]

@otoolep I removed the unused serv variable as well as updated the sample config.toml and README

[otoolep]

Great, thanks.

On Tue, Jul 7, 2015 at 10:27 AM, JP Phillips notifications@github.com
wrote:

@otoolep https://github.com/otoolep I removed the unused serv variable
as well as updated the sample config.toml and README

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