Fixed some bugs

[LanderOtto]

This commit fixes several problems.

• The asyncio.gather coroutine used in the is_available method of the ObjectToken and ListToken classes were never awaited
• In the Reduce size of database metadata #338 PR, the command table was not renamed in the get_reports query of the SqliteDatabase class
• Changed the style of variable names from CamelCase to snake_case
• Fixed typo of an attribute name in the LoopCombinatorStep class

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e340e17) 67.55% compared to head (d595916) 67.55%.

Files	Patch %	Lines
streamflow/main.py	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #333   +/-   ##
=======================================
  Coverage   67.55%   67.55%           
=======================================
  Files          83       83           
  Lines       10475    10475           
  Branches     2475     2475           
=======================================
  Hits         7076     7076           
  Misses       2960     2960           
  Partials      439      439           

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