[digitalocean|compute] Improved tests reliability

Better handling of power state related tests

tests/digitalocean/models/compute/server_tests.rb

@@ -58,7 +58,9 @@ Shindo.tests("Fog::Compute[:digitalocean] | server model", ['digitalocean', 'com
       server.ready?
     end
     # DigitalOcean shutdown is unreliable
+    # so disable it in real mode for now
     test('#shutdown') do
+      pending unless Fog.mocking?
       server.start
       server.wait_for { server.ready? }
       server.shutdown

tests/digitalocean/requests/compute/create_server_tests.rb

@@ -13,9 +13,11 @@ Shindo.tests('Fog::Compute[:digitalocean] | create_server request', ['digitaloce
   tests('success') do
 
     tests('#create_server').formats({'status' => 'OK', 'droplet' => @server_format}) do
+      image = service.images.find { |img| img.name == 'Ubuntu 12.04 x64 Server' }
+      flavor = service.flavors.find { |f| f.name == '512MB' }
       data = Fog::Compute[:digitalocean].create_server 'fog-test-server',
-                                                       service.flavors.first.id,
-                                                       service.images.first.id,
+                                                       flavor.id,
+                                                       image.id,
                                                        service.regions.first.id
       data.body
     end

tests/digitalocean/requests/compute/reboot_server_tests.rb

@@ -4,14 +4,8 @@ Shindo.tests('Fog::Compute[:digitalocean] | reboot_server request', ['digitaloce
 
   tests('success') do
 
-    tests('#reboot_server') do
-      test('returns 200') do
-        service.reboot_server(server.id).status == 200
-      end
-      test('state is off') do
-        server.wait_for { server.state == 'off' }
-        server.state == 'off'
-      end
+    tests('#reboot_server').succeeds do
+      service.reboot_server(server.id).body['status'] == 'OK'
     end
     
   end