Merge pull request #594 from carabasdaniel/fix_acceptance

Fix docker-machine acceptance test

Author: daianamezdrea

spec/acceptance/machine_spec.rb

@@ -26,7 +26,7 @@
     end
 
     it 'is installed and working' do
-      shell('docker-machine --help', acceptable_exit_codes: [0])
+      run_shell('docker-machine --help', expect_failures: false)
     end
   end
 
@@ -58,7 +58,7 @@ class { 'docker::machine':
     end
 
     it 'is installed and working' do
-      shell('docker-machine --help', acceptable_exit_codes: [0])
+      run_shell('docker-machine --help', expect_failures: false)
     end
   end
 end