dev-manual, ref-manual: removed "distrodata" class

Ousted these since it was noted in the migration section that
the class had been removed.  Modified all references to the
removed class as needed.

(From yocto-docs rev: 7000acc76da6b7ee850b799347ab9083663c7e6a)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-classes.xml

@@ -714,39 +714,6 @@
     </para>
 </section>
 
-<section id='ref-classes-distrodata'>
-    <title><filename>distrodata.bbclass</filename></title>
-
-    <para>
-        The <filename>distrodata</filename> class
-        provides for automatic checking for upstream recipe updates.
-        The class creates a comma-separated value (CSV) spreadsheet that
-        contains information about the recipes.
-        The information provides the
-        <link linkend='ref-tasks-distrodata'><filename>do_distrodata</filename></link>
-        and
-        <filename>do_distro_check</filename> tasks, which do upstream checking
-        and also verify if a package is used in multiple major distributions.
-    </para>
-
-    <para>
-        The class is not included by default.
-        To use it, you must set the
-        <link linkend='var-INHERIT'><filename>INHERIT</filename></link>
-        variable:
-        <literallayout class='monospaced'>
-     INHERIT+= "distrodata"
-        </literallayout>
-    </para>
-
-    <para>
-        The <filename>distrodata</filename> class also provides the
-        <link linkend='ref-tasks-checkpkg'><filename>do_checkpkg</filename></link>
-        task, which can be used against a simple recipe or against an
-        image to get all its recipe information.
-    </para>
-</section>
-
 <section id='ref-classes-distutils'>
     <title><filename>distutils*.bbclass</filename></title>