[Sonic Yang Tree]: Updating Tree as per modification in YANG models.#19

Merged

zhenggen-xu merged 4 commits intozhenggen-xu:sonic-cfg-mgmtfrom

praveen-li:sonic_yang_tree_update_dpb

Dec 14, 2019

Commits on Dec 12, 2019

[Sonic Yang Tree]: Updating Tree as per modification in YANG models.
Praveen Chaudhary
committed

Commits on Dec 13, 2019

[sonic-port.yang]: Making lanes and speed mandatory and admin_status not mandatory.
Praveen Chaudhary
committed
[yangTest.json]: Fix tests for YANG models.
Praveen Chaudhary
committed
[_sonic_yang_ext.py]: Exception handling for delete_node and find_dependencies.
Praveen Chaudhary
committed