Remove sonic-db-cli (#122)

#### Why I did it
    Fix sonic-db-cli high CPU usage on SONiC startup issue: sonic-net/sonic-buildimage#10218
    ETA of this issue will be 2022/05/31

#### How I did it
    Re-write sonic-cli with c++ in sonic-swss-common: sonic-net/sonic-swss-common#607
    Remove python version sonic-db-cli from swsssdk.

#### How to verify it
    Pass all E2E test scenario.

#### Which release branch to backport (provide reason below if selected)

<!--
- Note we only backport fixes to a release branch, *not* features!
- Please also provide a reason for the backporting below.
- e.g.
- [x] 202006
-->

- [ ] 201811
- [ ] 201911
- [ ] 202006
- [ ] 202012
- [ ] 202106
- [ ] 202111

#### Description for the changelog
    Remove python version sonic-db-cli from swsssdk

#### Link to config_db schema for YANG module changes
<!--
Provide a link to config_db schema for the table for which YANG model
is defined
Link should point to correct section on https://github.com/Azure/SONiC/wiki/Configuration.
-->

#### A picture of a cute animal (not mandatory but encouraged)

setup.py

@@ -15,7 +15,7 @@
  package_dir={'swsssdk': 'src/swsssdk'},
  packages=['swsssdk'],
  package_data={'swsssdk': ['config/*.json']},
- scripts=['src/swsssdk/scripts/sonic-db-cli'],
+ scripts=[],
  license='Apache 2.0',
  author='SONiC Team',
  author_email='linuxnetdev@microsoft.com',