fix bug setting device

The device set for the storage mount point was
hard-coded to /dev/$name. This value is only
valid when no device is supplied to the storage
xfs setup.

This commit updates it to use the target_device
which is either the device that was passed, or
/dev/$name if not device is specified.

manifests/storage/xfs.pp

@@ -50,7 +50,7 @@ define swift::storage::xfs(
   }
 
   swift::storage::mount { $name:
-    device         => "/dev/${name}",
+    device         => $target_device,
     mnt_base_dir   => $mnt_base_dir,
     subscribe      => Exec["mkfs-${name}"],
     loopback       => $loopback,

spec/defines/swift_storage_xfs_spec.rb

@@ -7,14 +7,14 @@ describe 'swift::storage::xfs' do
   describe 'when a device is specified' do
     let :default_params do
       {
-       :device       => 'some_device',
+       :device       => "/dev/#{title}",
        :byte_size    => '1024',
        :mnt_base_dir => '/srv/node',
        :loopback     => false
       }
     end
 
-    [{:device       => 'some_device'},
+    [{},
      {
        :device       => 'some_device',
        :byte_size    => 1,
@@ -38,8 +38,8 @@ describe 'swift::storage::xfs' do
           :require     => 'Package[xfsprogs]'
         )}
 
-        it { should contain_swift__storage__mount('foo').with(
+        it { should contain_swift__storage__mount(title).with(
-           :device       => '/dev/foo',
+           :device       => param_hash[:device],
            :mnt_base_dir => param_hash[:mnt_base_dir],
            :loopback     => param_hash[:loopback],
            :subscribe    => 'Exec[mkfs-foo]'