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What is this PR for?
It's adding option to specify column in scatterPlot, that will be displayed in label
What type of PR is it?
Feature
Todos
I had trouble to get label displayed for most of points. Label was triggered by cursor on different position than point was. See picture, my cursor was on position of red X. But this problem was there even before my edits and I think it should be handeled as separate issue. Mostly I was able to trigger labels when I selected only Y axis and hovered on points on bottom of chart.

What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-1283
How should this be tested?
reate scatterPlot and put some column in new 'label' field. Values from that column should appear in label corresponding to selected point.
Screenshots (if appropriate)