Display coordinator host name in web ui

[abhiseksaikia]

Now that all queries are collectively displayed in the coordinator web UI, regardless of which coordinator we choose to look at, we should also add the coordinator the query is running on, as a diagnostic for troubleshooting.

Test plan -
Tested by running in local

== RELEASE NOTES ==

General Changes
*  Display coordinator host name in web ui to support multi coordinator setup.

[swapsmagic]

LGTM

[tdcmeehan]

LGTM % I think we should be showing the node ID, not the IP address, as hosts can in theory come and go, however the ndoe ID shows the logic mapping of which process was assigned.

[abhiseksaikia]

LGTM % I think we should be showing the node ID, not the IP address, as hosts can in theory come and go, however the ndoe ID shows the logic mapping of which process was assigned.

Thanks Tim! This is a great point that host can come and go. Only caveat of adding node ID is that currently this information is not available with query info. So we have to introduce a new field in query info which we want to avoid here.

[tdcmeehan]

Looks like there's a merge conflict. LGTM otherwise

[abhiseksaikia]

Rebase and fixed merge conflict