hashi_vault - fix userpass auth method

[briantist]

SUMMARY

Fixes #66

Tests are going to be more work since none exist yet, tracking that in #67 .

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

hashi_vault

ADDITIONAL INFORMATION

[codecov]

Codecov Report

Merging #68 (490d87e) into main (089c63b) will decrease coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   82.70%   82.59%   -0.11%     
==========================================
  Files          13       13              
  Lines         769      770       +1     
  Branches       78       78              
==========================================
  Hits          636      636              
- Misses        119      120       +1     
  Partials       14       14              

Impacted Files	Coverage Δ
plugins/lookup/hashi_vault.py	63.15% <0.00%> (-0.31%)	⬇️

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[briantist]

@joao-p-marques confirmed (thank you!) in #66 that:

• the older hvac is not affected so userpass works in that
• that this PR works with later hvac