Handling invalid UTF-8 character in sys info (#2360)

In some operation systems, the sys info contains invalid characters.
In this patch try to keep the original fallback logic but filter out the cases when the character is invalid.

client/system/sysinfo_linux.go

@@ -0,0 +1,12 @@
+package system
+
+// SysInfo used to moc out the sysinfo getter
+type SysInfo struct {
+	ChassisSerial string
+	ProductSerial string
+	BoardSerial   string
+
+	ProductName   string
+	BoardName     string
+	ProductVendor string
+}