implement the new feature hw billing and vs billing

[caberos]

#1242

• hw billing
• vs billing

[allmightyspiff]

Code looks good. Just make sure all the table column names start with a capital letter. And fix the few I mentioned specifically.

[allmightyspiff]

Looks good. Last thing please add these commands to docs\cli\hardware.rst and docs\cli\vs.rst
Thanks.

[allmightyspiff]

for the failing unit tests, I'd recommend changing them so they don't require an EXACT match on the output because if you change the output, the test fails. Id recommend just checking a few key fields exist in the output like how the vs_tests/ def test_bandwidth_vs_quite(self): does it

[coveralls]

Coverage increased (+0.02%) to 94.492% when pulling 16ad4e0 on caberos:issue1242 into 8ac0957 on softlayer:master.