util: escapes special characters in VIR_LOG_REGEX

In debug mode, the bug failed to start vm
error: Failed to start domain rhel5u9
error: internal error Out of space while reading console log output:
...

src/util/virlog.c

@@ -80,7 +80,7 @@ static regex_t *virLogRegex = NULL;
 
 
 #define VIR_LOG_DATE_REGEX "[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]"
-#define VIR_LOG_TIME_REGEX "[0-9][0-9]:[0-9][0-9]:[0-9][0-9].[0-9][0-9][0-9]+[0-9][0-9][0-9][0-9]"
+#define VIR_LOG_TIME_REGEX "[0-9][0-9]:[0-9][0-9]:[0-9][0-9]\\.[0-9][0-9][0-9]\\+[0-9][0-9][0-9][0-9]"
 #define VIR_LOG_PID_REGEX "[0-9]+"
 #define VIR_LOG_LEVEL_REGEX "debug|info|warning|error"