Prevent address search click propagation to map

[ddohler]

Overview

Prevents clicks in the address search from propagating to the map.

Checklist

• PR has a descriptive enough title to be useful in changelogs

Notes

Also includes a fix to take out an NFS parameter from the Vagrantfile that causes problems on Ubuntu 18.04. Everyone is using 18.04 except @pcaisse and we've tested this on his machine to confirm that there don't seem to be any problems. If something crops up later we can reconsider.

Testing Instructions

• Provision or run ./scripts/grunt.sh web serve and navigate to localhost:7000 or localhost:7002, depending.
• Go to the map page.
• Click-and-drag on the address search text box, and double-click in the box and on the search button. Confirm that the map does not react to the these clicks.
• Confirm that the address search maintains existing functionality.

Closes #161460901