Monitor should use long instead of integer for "Scan (Entries/s)" graph

[brianloss]

When running Accumulo 1.10 on a large cluster with a very high scan rate, the "Scan (Entries/s)" graph flatlined at 2,147,483,647. Looking at the Monitor code, it appears that the queryRateOverTime and scanRateOverTime lists use an Integer instead of a Long to store the rates. Changing to a Long should solve the problem.

[ctubbsii]

This issue was fixed in 1.10 by #1860 . However, it is not yet merged to the main branch for 2.1.0. I don't know if 2.1 is similarly affected, but I assume so. So, this issue should stay open until it is fixed there (or determined to be unnecessary there).