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Why I did it
sonic-swss-common lib will add dependency to libyang soon, so need install libyang lib to prevent build and UT break.
How I did it
Modify azure pipeline to install libyang in azure pipeline steps.
How to verify it
Pass all UT.
Which release branch to backport (provide reason below if selected)
Description for the changelog
Modify azure pipeline to install libyang in azure pipeline steps.
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)