Add check for bulk import loaded columns that have no corresponding live fate operation

[keith-turner]

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

In Accumulo 4.0 when a bulk load operation fails it can leave behind loaded columns in tablets that reference fate operations that are not alive.

Describe the solution you'd like

Look for these with a new check in the accumulo admin check command. May want to consider adding options for cleaning them up also.

[keith-turner]

In 3.1 and 2.1 these loaded markers could be left behid because of race conditions. Because of this there was a mechanism in 3.1 and 2.1 to clean them up. In 4.0 that race condition should be gone, so do not want to automatically clean up. Thinking the check command can be used to find these and then they can be investigated and cleaned up.

[keith-turner]

Could also look for selected columns for which there is no live fate operation. These columns are placed by the fate operation that drives user compactions.