[202012] Fix caclmgrd crash issue when applying scale cacl rules #15630
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Cherry pick PR for sonic-net/sonic-host-services#62
Why I did it
Fix the issue #10883.
Work item tracking
How I did it
For performance reason, libswsscommon is not thread safe by design.
caclmgrd share config DB connection cross thread, so change to use new db connector in child thread.
How to verify it
Load scale ipv4/ipv6 rules and verify if caclmgrd is crashed
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)