rspec output format is explicitly set by ~/.rspec. But it can also be defined
in the directory where its being run: https://relishapp.com/rspec/rspec-core/v/3-8/docs/configuration/read-command-line-configuration-options-from-files
More about the config load order: http://rspec.info/documentation/3.8/rspec-core/RSpec/Core/Configuration.html