[202205] Fix sonic-db-cli dictionary output format not backward compatible issue #690
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This is to backport PR fix #678 to 202205 branch.
since the original PR has not been cherry-picked yet, so create this PR directly to backport the fix.
If the original PR will be cherry-picked, then this PR should be closed.
Why I did it
Fix sonic-db-cli dictionary output format not backward compatible issue: sonic-net/sonic-buildimage#11945
How I did it
Improve redis reply format method, keep same format with redis-py.
How to verify it
Add c++ unit test to cover all code.
Pass all E2E test scenario.
Which release branch to backport (provide reason below if selected)
Description for the changelog
Fix sonic-db-cli dictionary output format not backward compatible issue.
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)