Documentation: CPU speed implemented in stable-2.12

...hence move the design document from draft designs to
the implemented designs.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>

doc/design-2.12.rst

@@ -6,6 +6,7 @@ The following design documents have been implemented in Ganeti 2.12.
 
 - :doc:`design-daemons`
 - :doc:`design-systemd`
+- :doc:`design-cpu-speed`
 
 The following designs have been partially implemented in Ganeti 2.12.
 

doc/design-draft.rst

@@ -20,7 +20,6 @@ Design document drafts
    design-os.rst
    design-move-instance-improvements.rst
    design-node-security.rst
-   design-cpu-speed.rst
 
 .. vim: set textwidth=72 :
 .. Local Variables:

doc/index.rst

@@ -96,6 +96,7 @@ Draft designs
    design-bulk-create.rst
    design-chained-jobs.rst
    design-cmdlib-unittests.rst
+   design-cpu-speed.rst
    design-cpu-pinning.rst
    design-device-uuid-name.rst
    design-daemons.rst