Dump qemu driver capabilities if test debugging enabled

* src/testutils.[ch]: make testDebug externally available

* src/testutilsqemu.c: if VIR_TEST_DEBUG is set, dump the qemu
  driver capabilities to stderr

tests/testutils.c

@@ -45,8 +45,9 @@
     ((((int) ((T)->tv_sec - (U)->tv_sec)) * 1000000.0 +	\
       ((int) ((T)->tv_usec - (U)->tv_usec))) / 1000.0)
 
+unsigned int testDebug = 0;
+
 static unsigned int testOOM = 0;
-static unsigned int testDebug = 0;
 static unsigned int testCounter = 0;
 
 double

tests/testutils.h

@@ -43,4 +43,6 @@ int virtTestMain(int argc,
         return virtTestMain(argc,argv, func);   \
     }
 
+extern unsigned int testDebug;
+
 #endif /* __VIT_TEST_UTILS_H__ */

tests/testutilsqemu.c

@@ -4,6 +4,8 @@
 #include <stdlib.h>
 
 #include "testutilsqemu.h"
+#include "testutils.h"
+#include "memory.h"
 
 virCapsPtr testQemuCapsInit(void) {
     struct utsname utsname;
@@ -84,6 +86,18 @@ virCapsPtr testQemuCapsInit(void) {
                                       NULL) == NULL)
         goto cleanup;
 
+    if (testDebug) {
+        char *caps_str;
+
+        caps_str = virCapabilitiesFormatXML(caps);
+        if (!caps_str)
+            goto cleanup;
+
+        fprintf(stderr, "QEMU driver capabilities:\n%s", caps_str);
+
+        VIR_FREE(caps_str);
+    }
+
     return caps;
 
 cleanup: