crypto/keys: Reduce bcrypt parameter in tests

[ValarDragon]

Currently the crypto/keys tests take 2 minutes in circle CI.
A significant portion of this time is due to the bcrypt security
parameter. Changing it for these tests should reduce the time significantly.

• Added entries in PENDING.md that include links to the relevant issue or PR that most accurately describes the change. - not user facing

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #1937 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1937   +/-   ##
========================================
  Coverage    64.71%   64.71%           
========================================
  Files          114      114           
  Lines         6782     6782           
========================================
  Hits          4389     4389           
  Misses        2114     2114           
  Partials       279      279

[cwgoes]

utACK, danke!