wifi: add nopassword function in wifi.py
wifi: add nopassword function in wifi.py

In wifi.py library functions, add 1 function for password remember.

Signed-off-by: Zhang Jingke <0979c04a6d09a3b3c8dd699e3664fb112fdd2a5b@intel.com>

ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,ostroproject/meta-iotqa,wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,daweiwu/meta-iotqa-1,wanghongjuan/meta-iotqa-1,wanghongjuan/meta-iotqa-1,daweiwu/meta-iotqa-1,ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,ostroproject/meta-iotqa,daweiwu/meta-iotqa-1,ostroproject/meta-iotqa