Introduce QDict unit-tests

This suite contains tests to assure that QDict API works as expected.

To execute it you should have check installed and build QEMU with
check support enabled (--enable-check-utests) and then run:

$ ./check-qdict

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/configure b/configure
index c2944c5..64a0391 100755
--- a/configure
+++ b/configure
@@ -1927,7 +1927,7 @@
   if [ "$linux" = "yes" ] ; then
       tools="qemu-nbd\$(EXESUF) qemu-io\$(EXESUF) $tools"
     if [ "$check_utests" = "yes" ]; then
-      tools="check-qint check-qstring $tools"
+      tools="check-qint check-qstring check-qdict $tools"
     fi
   fi
 fi