Correct display of BulkImport duration in monitor

[EdColeman]

The formatting for monitor display accepts milliseconds. This
fix corrects issue where seconds (duration / 1000) were used,
causing the duration displayed by the monitor to format and display
incorrectly.

[ctubbsii]

@EdColeman A few helpful things for using GitHub:

• There is no need to create an issue and a PR if you are creating them at the same time. GitHub PRs are their own issue. Sometimes it's useful to create an issue for future work.
• It is not necessary to close a PR and create a new one to change the branch. You can click the "Edit" button and select a different branch to do the PR against from the drop-down.
• When you use the form "ACCUMULO-NNN", it automatically links against the JIRA issue with that ID, and that JIRA issue (such as https://issues.apache.org/jira/browse/ACCUMULO-551) may be completely unrelated. GitHub issues are mentioned using the pound syntax: Monitor - BulkInput displays incorrectly formatted duration for import age. #551

[ctubbsii]

Do you know if a similar issue affects the 2.0 monitor?

[EdColeman]

The code for 2.0 has changed such that I do not see the same issue - but I'll need to dig deeper to find the actual display code - a quick look and it seems that milliseconds are being passed around.