Nise enhancements to help QE and some yaml fixes

[cgoodfred]

A lot of discussions with QE led to some nise changes that include yaml gen benefits and some consistency between bigq and csv gen. Some of those changes include:

• Specifying usage.amount, usage.amount_in_pricing_units in a yaml now works and bases calculated values off those inputs.
• Specifying both a usage.amount_in_pricing_unitsand a price in the yaml will result in a cost that is the pricing unit amount times the price.
• Specifying a usage.unit will now select an SKU with a matching usage unit.
• System labels apply to the appropriate things
• billing_account_id now only generates one word instead of multiple to handle the 20 character max on koku
• A little adjustment to ensure local and bigq match better, there were some minor differences
• Testing updates based on the changes

Here is an example yml with some of the usage data that is now usable (remove the .txt github does not allow the uploading of ymls): usage_example.yml.txt

[codecov[bot]]

Codecov Report

Merging #334 (002c14e) into master (ca73f3d) will increase coverage by 0.2%. The diff coverage is 87.4%.

@@           Coverage Diff            @@
##           master    #334     +/-   ##
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+ Coverage    93.4%   93.5%   +0.2%     
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  Files          45      45             
  Lines        3286    3270     -16     
  Branches      447     446      -1     
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- Hits         3069    3059     -10     
- Misses        117     118      +1     
+ Partials      100      93      -7