add a valid variable definition file extension to list of exceptions

[gek0]

Fix for #1330

https://www.terraform.io/docs/configuration/variables.html#variable-definitions-tfvars-files

Terraform also automatically loads a number of variable definitions files if they are present:

Files named exactly terraform.tfvars or terraform.tfvars.json.
Any files with names ending in .auto.tfvars or .auto.tfvars.json.

[codecov]

Codecov Report

Merging #1331 (2a40bf6) into master (2ac77db) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1331   +/-   ##
=======================================
  Coverage   70.05%   70.05%           
=======================================
  Files          74       74           
  Lines        5540     5540           
=======================================
  Hits         3881     3881           
  Misses       1303     1303           
  Partials      356      356           

Impacted Files	Coverage Δ
server/events/project_finder.go	90.90% <100.00%> (ø)

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[jamengual]

@gek0 could you run fmt please?

[gek0]

@jamengual done

[jamengual]

@gek0 when we cut the new release this will be added