Make Regionservers log which tables it removed coprocessors from when aborting

When a coprocessor throws a runtime exception (e.g. NPE), the regionserver handles this according to hbase.coprocessor.abortonerror.

If the coprocessor was loaded on a specific table, the output in the logs give no indication as to which table the coprocessor was removed from (or which version, or jarfile is the culprit). This causes longer debugging and recovery times.