fixes error with concurrent merge and bulk import #5850
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When the bulk import code was scanning outside of its locked range this caused an error when there was a concurrent merge. Added detection of this case and throw the correct exception. Found this bug when running apache/accumulo-testing#299.
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When the bulk import code was scanning outside of its locked range this caused an error when there was a concurrent merge. Added detection for this case and threw the correct exception instead of an internal error. Found this bug when running apache/accumulo-testing#299.