Filter jail integration tests unless on FreeBSD

Jails are only available on FreeBSD, running the integration tests on
Linux will fail, so exclude these tests unless we run FreeBSD.

Author: smortex

spec/spec_helper.rb

@@ -48,6 +48,7 @@
   end
 
   config.filter_run_excluding windows: true unless Bolt::Util.windows?
+  config.filter_run_excluding jail: true unless RUBY_PLATFORM =~ /-freebsd\d+\z/
 
   # rspec-mocks config
   config.mock_with :rspec do |mocks|