Increase Max timeout for get_ursulas/bucket_sampling; fix faulty env variable usage

[derekpierre]

Type of PR:

• Bugfix
• Feature
• Documentation
• Other

Required reviews:

• 1
• 2
• 3

What this does:

• Increase max timeouts for now for /get_ursulas and /bucket_sampling - separate investigation can be done into efficiency improvements (Investigate optimizations when version restriction represents low percentage of node population #78)
• Separate default timeout from max timeout, especially now that the max timeout has been extended
• Fix bug where environment variables, when set, were incorrectly used as strings - cast values obtained from environment variables to integers.

Issues fixed/closed:

• Fixes #...

Why it's needed:

Explain how this PR fits in the greater context of the NuCypher Network.
E.g., if this PR addresses a nucypher/productdev issue, let reviewers know!

Notes for reviewers:

What should reviewers focus on?
Is there a particular commit/function/section of your PR that requires more attention from reviewers?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.57%. Comparing base (d540b7c) to head (8224acc).

Additional details and impacted files

@@               Coverage Diff               @@
##           development      #77      +/-   ##
===============================================
+ Coverage        90.55%   90.57%   +0.02%     
===============================================
  Files               18       18              
  Lines              900      902       +2     
===============================================
+ Hits               815      817       +2     
  Misses              85       85              

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[theref]

separate investigation can be done into efficiency improvments

is there an issue for this?

[theref]

love it

[derekpierre]

separate investigation can be done into efficiency improvments

is there an issue for this?

There is one now - #78 - 😆