Set provisioner names to symbol

Because Vagrant is handling provisioner names to be symbols more
uniformly now, update the mocked tests to reflect this change. Otherwise
these provisioners will be ignored and not run.

test/unit/vagrant/action/builtin/provision_test.rb

@@ -107,13 +107,13 @@
         end
 
         it "should not run if provision types are set and provisioner is not included" do
-          env[:provision_types] = ["other-provisioner", "other-test"]
+          env[:provision_types] = [:"other-provisioner", :"other-test"]
           expect(hook).not_to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end
 
         it "should run if provision types are set and include provisioner name" do
-          env[:provision_types] = ["spec-test"]
+          env[:provision_types] = [:"spec-test"]
           expect(hook).to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end
@@ -142,13 +142,13 @@
         end
 
         it "should not run if provision types are set and provisioner is not included" do
-          env[:provision_types] = ["other-provisioner", "other-test"]
+          env[:provision_types] = [:"other-provisioner", :"other-test"]
           expect(hook).not_to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end
 
         it "should run if provision types are set and include provisioner name" do
-          env[:provision_types] = ["spec-test"]
+          env[:provision_types] = [:"spec-test"]
           expect(hook).to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end
@@ -177,13 +177,13 @@
         end
 
         it "should not run if provision types are set and provisioner is not included" do
-          env[:provision_types] = ["other-provisioner", "other-test"]
+          env[:provision_types] = [:"other-provisioner", :"other-test"]
           expect(hook).not_to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end
 
         it "should run if provision types are set and include provisioner name" do
-          env[:provision_types] = ["spec-test"]
+          env[:provision_types] = [:"spec-test"]
           expect(hook).to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end
@@ -192,7 +192,7 @@
           File.open(File.join(data_dir.to_s, "action_provision"), "w") do |file|
             file.write("1.5:machine-id")
           end
-          env[:provision_types] = ["spec-test"]
+          env[:provision_types] = [:"spec-test"]
           expect(hook).to receive(:call).with(:provisioner_run, anything)
           instance.call(env)
         end