Support using dictionaries as hosts in Terraform connector

[Fizzadar]

TODO: tests

[codecov]

Codecov Report

Merging #930 (b7a564f) into 2.x (1850b1d) will decrease coverage by 0.13%.
The diff coverage is 0.00%.

❗ Current head b7a564f differs from pull request most recent head 1718943. Consider uploading reports for the commit 1718943 to get more accurate results

@@            Coverage Diff             @@
##              2.x     #930      +/-   ##
==========================================
- Coverage   91.60%   91.47%   -0.14%     
==========================================
  Files         124      125       +1     
  Lines        8051     8066      +15     
==========================================
+ Hits         7375     7378       +3     
- Misses        676      688      +12     

Impacted Files	Coverage Δ
pyinfra/connectors/terraform.py	25.64% <0.00%> (-5.61%)	⬇️
pyinfra_cli/util.py	81.01% <0.00%> (-2.94%)	⬇️
pyinfra/api/host.py	91.52% <0.00%> (ø)
pyinfra/facts/server.py	100.00% <0.00%> (ø)
pyinfra/operations/iptables.py	100.00% <0.00%> (ø)
pyinfra/facts/util/distro.py	84.61% <0.00%> (ø)
pyinfra_cli/main.py	85.97% <0.00%> (+0.05%)	⬆️
pyinfra/api/operation.py	90.62% <0.00%> (+0.14%)	⬆️
pyinfra/connectors/ssh.py	89.96% <0.00%> (+0.21%)	⬆️

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