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### _Why are the changes needed?_
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1. the default value of `kyuubi.ha.zookeeper.namespace` is `kyuubi`
2. the beeline's variable `zooKeeperNamespace` is case-sensitive
3. how to configure kyuubi ha
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [ ] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1320 from cfmcgrady/ha-bug.
Closes#1320
16f56377 [Fu Chen] add ha configurations link
7acee980 [Fu Chen] update high_availability_guide.md
bfcab300 [Fu Chen] update high_availability_guide.md
7d9f88cb [Fu Chen] Revert "add conf kyuubi.ha.enabled"
d6874800 [Fu Chen] Revert "update docs"
b31d9ca8 [Fu Chen] Revert "default false"
343bae44 [Fu Chen] default false
3a4934e8 [Fu Chen] update docs
7acf3d52 [Fu Chen] add conf kyuubi.ha.enabled
936d6e7d [Fu Chen] update high_availability_guide.md
Authored-by: Fu Chen <cfmcgrady@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>
cc22888fa7