Init page sizes in qtest

One of my patches used a loop that was based on host page size;
it dies in qtest since qtest hadn't bothered init'ing it.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Message-Id: <1439463094-5394-4-git-send-email-dgilbert@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
diff --git a/qtest.c b/qtest.c
index 05cefd2..8e10340 100644
--- a/qtest.c
+++ b/qtest.c
@@ -657,6 +657,7 @@
 
     inbuf = g_string_new("");
     qtest_chr = chr;
+    page_size_init();
 }
 
 bool qtest_driver(void)