remove encoding for user data input

[mamclaughlin]

Description

Removes the userdata encoding on govultr side and allows instead for the vultr api to error handle if an unencoded string is passed. Affects baremetal userdata and instance user data

Related Issues

Supports #71

Checklist:

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you linted your code locally prior to submission?
• Have you successfully ran tests with your changes locally?

[codecov]

Codecov Report

Merging #73 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   72.09%   72.07%   -0.03%     
==========================================
  Files          24       24              
  Lines        2684     2682       -2     
==========================================
- Hits         1935     1933       -2     
  Misses        377      377              
  Partials      372      372              

Impacted Files	Coverage Δ
bare_metal_server.go	74.12% <100.00%> (-0.07%)	⬇️
server.go	71.56% <100.00%> (-0.05%)	⬇️

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