<!--
Thanks for sending a pull request!
Here are some tips for you:
1. If this is your first time, please read our contributor guidelines: https://kyuubi.readthedocs.io/en/latest/community/contributions.html
2. If the PR is related to an issue in https://github.com/apache/incubator-kyuubi/issues, add '[KYUUBI #XXXX]' in your PR title, e.g., '[KYUUBI #XXXX] Your PR title ...'.
3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][KYUUBI #XXXX] Your PR title ...'.
-->
### _Why are the changes needed?_
<!--
Please clarify why the changes are needed. For instance,
1. If you add a feature, you can talk about the use case of it.
2. If you fix a bug, you can clarify why it is a bug.
-->
Support launch query engine asynchronously during opening session, make it more user-friendly.
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1346 from turboFei/kyuubi_hive_jdbc_ext.
Closes#1346
513691d6 [fwang12] address comments
63b8f901 [fwang12] remove hanle to client
4590ad98 [fwang12] remove synchronized
f3b136b4 [fwang12] add ut for open session with failure
2cae9afa [fwang12] address comments
35113d0f [fwang12] add engine session id to session event
34c27f9c [fwang12] refactor log
b5f7e639 [fwang12] block
b8b0cf9d [fwang12] to support aync client
66eb07f3 [fwang12] address comments
623c0511 [fwang12] volatile
282c9f07 [fwang12] refactor conf
5047d91d [fwang12] server session handle is not same with that of engine
dc1cb8bc [fwang12] update docs
b773fd9d [fwang12] refactor
5f657e44 [fwang12] add ut
9e56cbab [fwang12] exclude engine init engine
6abdb52c [fwang12] refactor
d3e37a8c [fwang12] block until engine finished
085b324d [fwang12] save
Authored-by: fwang12 <fwang12@ebay.com>
Signed-off-by: fwang12 <fwang12@ebay.com>
1554032df2