Remove base64 encoding of user data on create

[nsmith5]

Description

Don't not base64 encode userdata on server and bare-metal creation. This matches behaviour from #73.

Related Issues

• terraform-provider-vultr #68

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 #100 into master will decrease coverage by 2.76%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
- Coverage   72.00%   69.24%   -2.77%     
==========================================
  Files          24       24              
  Lines        2704     2461     -243     
==========================================
- Hits         1947     1704     -243     
  Misses        381      381              
  Partials      376      376              

Impacted Files	Coverage Δ
bare_metal_server.go	71.34% <100.00%> (-2.79%)	⬇️
server.go	68.25% <100.00%> (-3.04%)	⬇️
application.go	63.63% <0.00%> (-5.60%)	⬇️
plans.go	66.10% <0.00%> (-4.92%)	⬇️
iso.go	62.79% <0.00%> (-4.56%)	⬇️
api.go	55.55% <0.00%> (-4.45%)	⬇️
account.go	55.55% <0.00%> (-4.45%)	⬇️
regions.go	64.70% <0.00%> (-4.26%)	⬇️
os.go	57.14% <0.00%> (-4.15%)	⬇️
backup.go	69.23% <0.00%> (-4.11%)	⬇️
... and 16 more

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[ddymko]

Thanks for submitting a fix for this! I'll tag and cut a release for this later today