* [yang-models]: Remove PLY Extensions and change translation code.
With assumption that TABLE_SEPARATOR and ENTRY_SEPARATOR for configDB is always "|",
translation from configDB.json to sonicYang.json can be done based on keys specified
in YANG Lists inside YANG models. So removing extensions is good idea.
Changes:
-- Remove use of regex in Translation code.
-- Remove regex Extensions from YANG models.
-- Improved debugging i.e. log on stdout in case of any Exception from sonic-yang-mgmt,
so that failed tests can be debugged faster. Also this is good to debug Dynamic
port breakout issues.
-- Minor Test changes.
Co-authored-by: lguohan <lguohan@gmail.com>
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