Some cleanup

[richafrank]

Some cleanup that was pulled out of a no-longer-useful branch I had been working on:

• Fixed a docstring
• Standardized on key_from_ireq for use with InstallRequirements. It had been a mix of key_from_ireq(ireq) and key_from_req(ireq.req).
• Ensured that a finally block can run even if NamedTemporaryFile construction raises

Changelog-friendly one-liner: Minor cleanup, including standardizing on key_from_ireq

[atugushev]

Thank you so much! Reading my mind 😉

[codecov]

Codecov Report

Merging #1068 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1068      +/-   ##
==========================================
+ Coverage   99.26%   99.34%   +0.08%     
==========================================
  Files          34       34              
  Lines        2446     2446              
  Branches      306      306              
==========================================
+ Hits         2428     2430       +2     
+ Misses         10        8       -2     
  Partials        8        8              

Impacted Files	Coverage Δ
piptools/repositories/pypi.py	93.65% <0.00%> (+0.97%)	⬆️
piptools/utils.py	100.00% <0.00%> (ø)	⬆️

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