renamed cache_invalidator to task_idempotency_token

[eamonnfaherty]

Issue #, if available:

Description of changes:

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[codecov-commenter]

Codecov Report

Base: 36.73% // Head: 38.01% // Increases project coverage by +1.28% 🎉

Coverage data is based on head (d680abc) compared to base (bd2330e).
Patch coverage: 80.39% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #636      +/-   ##
==========================================
+ Coverage   36.73%   38.01%   +1.28%     
==========================================
  Files         154      155       +1     
  Lines        8546     8705     +159     
  Branches     1182     1188       +6     
==========================================
+ Hits         3139     3309     +170     
+ Misses       5376     5364      -12     
- Partials       31       32       +1     

Impacted Files	Coverage Δ
servicecatalog_puppet/aws.py	9.72% <ø> (ø)
servicecatalog_puppet/cli.py	0.00% <0.00%> (ø)
servicecatalog_puppet/commands/graph.py	23.33% <ø> (ø)
servicecatalog_puppet/commands/management.py	13.02% <ø> (-0.46%)	⬇️
servicecatalog_puppet/commands/orgs.py	0.00% <0.00%> (ø)
servicecatalog_puppet/commands/show_codebuilds.py	0.00% <0.00%> (ø)
servicecatalog_puppet/commands/show_pipelines.py	0.00% <0.00%> (ø)
servicecatalog_puppet/commands/task_reference.py	0.00% <0.00%> (ø)
...nds/task_reference_helpers/generators/generator.py	0.00% <ø> (ø)
...ands/task_reference_helpers/generators/launches.py	0.00% <0.00%> (ø)
... and 119 more

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