[SIMB-1858] update easycwmp to v1.6.1

[SIMB-1858] update easycwmp to v1.6.1

Update TR-069 framework easycwmp to latest upstream version:

* EasyCwmp-1.6.1 (date of 04th of December 2017)
  -#0000305: do not replace multispace by 1 space in the xml tag values