[Sonic yang models]: Added the sonic yang models for acl, port, portchannel, vlan, vrf, interface etc#4001

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anand-kumar-subramanian wants to merge 6 commits intosonic-net:masterfrom anand-kumar-subramanian:master

+1,262-4

Commits on Jan 9, 2020

Removing the libYang exports which were pointing to the wrong directory
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Commits on Jan 23, 2020

Merge pull request #1 from Azure/master
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Adding the sonic yang models for acl, port, portchannel, vlan, vrf, interface etc
anand-kumar-subramanian
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Commits on Jan 24, 2020

Commits on May 6, 2020

Added database service as requirement and removed swss. Also added database, swss and syncd to After list
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