Purge package sonic-db-cli which depends on libswsscommon

[qiluo-msft]

What I did
Purge package sonic-db-cli which depends on libswsscommon

Why I did it
Since sonic-db-cli depends on libswsscommon, we could not simply only purge libswsscommon, so we purge both together.

The build error is as below

Step 8/22 : RUN dpkg --purge libswsscommon
 ---> Running in 0297ee02869f
dpkg: dependency problems prevent removal of libswsscommon:
 sonic-db-cli depends on libswsscommon.

How I verified it

Details if related

[theasianpianist]

Do we also need to re-install sonic-db-cli with the other packages so that it's available in the DVS?

[lguohan]

i guess we should. but now sure if vstest is using sonic-db-cli?

[theasianpianist]

i guess we should. but now sure if vstest is using sonic-db-cli?

Don't think the tests are using it, but it may be useful for manual debugging if someone needs to download a DVS image from AZP

[prsunny]

Following VS test failures on WB is being analyzed and not caused by this change.

test_warm_reboot.py::TestWarmReboot::test_swss_neighbor_syncup FAILED    [ 96%]
test_warm_reboot.py::TestWarmReboot::test_OrchagentWarmRestartReadyCheck FAILED [ 96%]
test_warm_reboot.py::TestWarmReboot::test_swss_port_state_syncup FAILED  [ 96%]
test_warm_reboot.py::TestWarmReboot::test_routing_WarmRestart FAILED     [ 96%]

Inorder to unblock the rest of the PRs, need to force-merge this.