virsh: Make "DEBUG" loglevel the superset

Aligning loglevel values of virsh to that of libvirt.
"DEBUG"=0 loglevel, when specified through commandline or
env variable, should log all the messages. "ERROR=4"
should log only error messages.
Signed-off-by: NSupriya Kannery <supriyak@in.ibm.com>

tools/virsh.c

@@ -13331,13 +13331,17 @@ vshDebug(vshControl *ctl, int level, const char *format, ...)
     va_list ap;
     char *str;
 
+    /* Aligning log levels to that of libvirt.
+     * Traces with levels >=  user-specified-level
+     * gets logged into file
+     */
+    if (level < ctl->debug)
+        return;
+
     va_start(ap, format);
-    vshOutputLogFile(ctl, VSH_ERR_DEBUG, format, ap);
+    vshOutputLogFile(ctl, level, format, ap);
     va_end(ap);
 
-    if (level > ctl->debug)
-        return;
-
     va_start(ap, format);
     if (virVasprintf(&str, format, ap) < 0) {
         /* Skip debug messages on low memory */