[3513] added some notices about the embedded config.report

doc/guide/ddns.xml

@@ -94,6 +94,17 @@
       </itemizedlist>
 
       <para>
+      As for any Kea executable binary, the <filename>config.report</filename>
+      file produced by <userinput>./configure</userinput> is embbeded.
+      The command extracting it is:
+<screen>
+strings <userinput>path</userinput>/kea-dhcp-ddns | sed -n 's/;;;; //p'
+</screen>
+      Beware the <userinput>path</userinput> to use for a binary
+      in the build tree finishes by <filename>.libs</filename>.
+      </para>
+
+      <para>
       Upon start up the module will load its configuration and begin listening
       for NCRs based on that configuration.
       </para>

doc/guide/dhcp4-srv.xml

@@ -58,6 +58,17 @@
       </itemizedlist>
 
       <para>
+            As for any Kea executable binary, the <filename>config.report</filename>
+            file produced by <userinput>./configure</userinput> is embbeded.
+            The command extracting it is:
+<screen>
+strings <userinput>path</userinput>/kea-dhcp4 | sed -n 's/;;;; //p'
+</screen>
+            Beware the <userinput>path</userinput> to use for a binary
+            in the build tree finishes by <filename>.libs</filename>.
+      </para>
+
+      <para>
 	    When running in a console, the server can be shut down by
 	    pressing ctrl-c. It detects the key combination and shuts
 	    down gracefully.

doc/guide/dhcp6-srv.xml

@@ -56,6 +56,17 @@
       </itemizedlist>
 
       <para>
+            As for any Kea executable binary, the <filename>config.report</filename>
+            file produced by <userinput>./configure</userinput> is embbeded.
+            The command extracting it is:
+<screen>
+strings <userinput>path</userinput>/kea-dhcp6 | sed -n 's/;;;; //p'
+</screen>
+            Beware the <userinput>path</userinput> to use for a binary
+            in the build tree finishes by <filename>.libs</filename>.
+      </para>
+
+      <para>
 	    When running in a console, the server can be shut down by
 	    pressing ctrl-c. It detects the key combination and shuts
 	    down gracefully.

doc/guide/install.xml

@@ -334,6 +334,12 @@ Debian and Ubuntu:
           dependencies.
         </para>
 
+        <para>
+          <userinput>./configure</userinput> when it succeeds displays a report
+          with the building parameters. This report is saved into 
+          <filename>config.report</filename> and embedded into executable
+          binaries, e.g., <userinput>kea-dhcp4</userinput>.
+        </para>
 
       </section>