[Impala-ASF-CR] IMPALA-8163: Add banner showing local catalog mode on web UI when enabled.

["Anurag Mantripragada (Code Review)" <ge...@cloudera.org>]

Anurag Mantripragada has uploaded a new patch set (#6). ( http://gerrit.cloudera.org:8080/12413 )

Change subject: IMPALA-8163: Add banner showing local catalog mode on web UI when enabled.
......................................................................

IMPALA-8163: Add banner showing local catalog mode on web UI
when enabled.

Added a banner on coordinator web UI for visibility of local
catalog mode.

Testing:
1. Added a test in test_local_catalog to scrape webpages and
search for strings. Tested banner appears when local catalog
mode is enabled.
2. Refactored parts of test_local_catalog into
TestObservability class.

Change-Id: Iaeb2c7b20742a2630d9509da9b629d5f45c55207
---
M be/src/util/default-path-handlers.cc
M tests/custom_cluster/test_local_catalog.py
M www/root.tmpl
3 files changed, 88 insertions(+), 62 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/13/12413/6
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Iaeb2c7b20742a2630d9509da9b629d5f45c55207
Gerrit-Change-Number: 12413
Gerrit-PatchSet: 6
Gerrit-Owner: Anurag Mantripragada <an...@gmail.com>
Gerrit-Reviewer: Anurag Mantripragada <an...@gmail.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>