[KYUUBI #897] Support stop Spark engine through web ui
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### _Why are the changes needed?_
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Closes https://github.com/apache/incubator-kyuubi/issues/897
### _How was this patch tested?_
The following two images show the stop feature is enabled:
The following image show the stop feature is disabled:
Closes #898 from ulysses-you/kyuubi-897.
Closes #897
61ad25c1 [ulysses-you] address comment
b63997ec [ulysses-you] maven
dbb36014 [ulysses-you] maven
3c91307c [ulysses-you] simplify
6e9e5bca [ulysses-you] pom
4e143657 [ulysses-you] config
e579e227 [ulysses-you] Support stop Spark engine through web ui
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
065c98a259
