Directory restructure (for develop-4.0 branch)

[nicklesimba]

Moved multus-cni to Standard Go Project Layout.

General Change Log

• Directories such as checkpoint/multus/k8sclient have been moved under pkg directory to better fit the standard layout.
• Main function has been moved out of multus.go to main.go in cmd directory to better fit the standard layout.
• Dockerfiles have been moved to deployments directory to better fit the standard layout.
• Imports for project files have been modified to reflect the above changes and compile.

[coveralls]

Pull Request Test Coverage Report for Build 140049588

• 7 of 12 (58.33%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 71.525%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/multus/multus.go	7	12	58.33%

Totals
Change from base Build 131366052:	0.0%
Covered Lines:	1065
Relevant Lines:	1489

---

💛 - Coveralls

[s1061123]

How about to move it to 'cmd/multus/main.go' to put another binary in the repo...

[s1061123]

README.md uses the 'https://github.com/intel/multus-cni/blob/master/doc/images/Multus.png' image, which is renamed in your PR.

Could you please change the URL?

[dougbtv]

@s1061123 Hey Tomo, we had some trouble with getting github to properly merge without a conflict, when cherry picking locally, no conflicts what-so-ever, so I decided I would pick the commit and just push it up manually.

You'll find it at the head of develop-4.0 👍