Add container param to set static instrumentation uuid

Since moving to containers, the instrumentation uuid used to identify the host for metrics gets regenerated every time a new container is started. Since the list of hosts is keyed by this id, it makes the list of containers longer over time, needed to scroll a lot before seeing the graphs. The suspicion that this might happen was guessed at in GRP-1856.

The number of uuids can be reduced by being able to set it per container. So the UI in a certain environment would have one, WS in the same environment would have another, the UI in a different environment another, etc.

This may not be enough, since there is another column "Server Label" which is the machine name. In OpenShift at least this gets a new name for every container, so fixing the uuid wouldn't reduce the number of rows.

Maybe make the list collapsible so it doesn't take so much scrolling? Or put it after the graphs?