Clarify meaning of the LAVA hostname

Change-Id: I0482180030b8de42311bde45a479351f86071bf0
Revert "LAVA-1488: View JobTable without health checks."

Fix bug #761 - enabling discrete queries by default causes 
simple searches to be disabled.

This reverts commit 59018765341d383dec53c46d3d8e9d5db00d6a5a.

Change-Id: I51092213eb8d5585fc5ab9ddb4254dbf4ed1ad77