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This patch adds support to display the HA status of catalog and statestore on the root web page. The status will be presented as "Catalog Status: Active" or "Statestore Status: Standby" based on the values retrieved from the metrics catalogd-server.active-status and statestore.active-status. If the catalog or statestore is standalone, it will show active as the status, which is same as the metric. Tests: Ran core tests. Manually tests the web page, and verified the status display is correct. Also checked the situation when the failover happens, the current 'standby' status can be changed to 'active'. Change-Id: Ie9435ba7a9549ea56f9d080a9315aecbcc630cd2 Reviewed-on: http://gerrit.cloudera.org:8080/21294 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>