Fix mysql_grant acceptance test

mysql_grant now checks for mysql command

Author: hunner

spec/acceptance/types/mysql_grant_spec.rb

@@ -617,7 +617,7 @@ class { 'mysql::server':
 
       mysql_cmd = shell('which mysql').stdout.chomp
       shell("mv #{mysql_cmd} #{mysql_cmd}.bak")
-      expect(apply_manifest(pp, expect_failures: true).stderr).to match(%r{Command mysql is missing})
+      expect(apply_manifest(pp, expect_failures: true).stderr).to match(%r{Could not find a suitable provider for mysql_grant})
       shell("mv #{mysql_cmd}.bak #{mysql_cmd}")
     end