Log dtrace/systemd probes at INFO level instead of DEBUG

Every dtrace/systemd probe also include a libvirt log message.
These are logged at level DEBUG currently, which means if you
want to see all probes they are drowned by the rest of the
DEBUG messages. Since we don't really use the INFO log level
for much, it seems reasonable to suggest we log all probes at
level INFO.

src/util/virprobe.h

@@ -83,8 +83,8 @@
 
 #  define PROBE_EXPAND(NAME, ARGS) NAME(ARGS)
 #  define PROBE(NAME, FMT, ...)                              \
-    VIR_DEBUG_INT(&virLogSelf,                               \
-                  NULL, __LINE__, __func__,                  \
+    VIR_INFO_INT(&virLogSelf,                                \
+                  __FILE__, __LINE__, __func__,              \
                   #NAME ": " FMT, __VA_ARGS__);              \
     if (LIBVIRT_ ## NAME ## _ENABLED()) {                    \
         PROBE_EXPAND(LIBVIRT_ ## NAME,                       \
@@ -92,9 +92,9 @@
     }
 # else
 #  define PROBE(NAME, FMT, ...)                              \
-    VIR_DEBUG_INT(&virLogSelf,                               \
-                  NULL, __LINE__, __func__,                  \
-                  #NAME ": " FMT, __VA_ARGS__);
+    VIR_INFO_INT(&virLogSelf,                                \
+                 __FILE__, __LINE__, __func__,               \
+                 #NAME ": " FMT, __VA_ARGS__);
 # endif
 
 #endif /* __VIR_PROBE_H__ */