Run eventual scans in ComprehensiveIT

[keith-turner]

Is your feature request related to a problem? Please describe.

ComprehensiveIT tries to touch as much of the Accumulo public API as possible in a singe test. The test does not currently run eventual scans. Would be good to add this to ComprehensiveIT to know if the feature is working at the most basic level.

Describe the solution you'd like

Add a new test or modify an existing one in ComprehensiveIT to run eventual scans. Should be done in such a way that its easy to verify that eventual scans are running, can do something like the following.

1. Add data to table
2. Run eventual scan
3. Add new data to table
4. Run 2nd eventual scan, should not see new data.

[ArbaazKhan1]

I can take a look at this