Make Slirp statistics gathering and output conditional to LOG_ENABLED

Add 'info slirp' command to monitor to display statistics
Disable Slirp debugging code by default


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3451 c046a42c-6fe2-441c-8c8c-71466251a162

vl.c

@@ -3782,6 +3782,10 @@ void net_slirp_smb(const char *exported_dir)
 }
 
 #endif /* !defined(_WIN32) */
+void do_info_slirp(void)
+{
+    slirp_stats();
+}
 
 #endif /* CONFIG_SLIRP */