Improve usability of cloudlab profiles

[WilliamMaa]

This PR relates to issue #262. I fixed some documentation issues, and improved general usability of onvm.

Summary:

1. Now you can compile everything in the root directory instead of compiling dpdk, manager and examples separately.
2. For cloudlab profiles, you only need to run setup_cloudlab.sh to setup all the environmental variables and do the environment setup. Usage:

This PR includes
Resolves issues	#262
Breaking API changes
Internal API changes
Usability improvements	X
Bug fixes
New functionality
New NF/onvm_mgr args
Changes to starting NFs
Dependency updates
Web stats updates

Merging notes:

• Dependencies: None

TODO before merging :

• [X] PR is ready for review

Test Plan:

Try doing a make in a Ubuntu 20 environment under the root directory, see if it can correctly make everything. On cloudlab profiles, run setup_cloudlab.sh see if it correctly does the setup.

Review:

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[onvm]

In response to PR creation

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[twood02]

These changes look good to me. @kevindweb or @dennisafa will one of you be able to double check this and then merge it? We would like these changes merged into master soon so we can update the cloudlab profile.

[WilliamMaa]

I think it is better that we do not include making dpdk in the root Makefile, I think dpdk's build is a little complicated than I imagined.

[kevindweb]

@onvm sanity

[onvm]

@onvm sanity

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[twood02]

@dennisafa when you have a chance, please sync this to master too (you don't need to make a full release).