Update sw.py

Add Quidway S6700-24-EI as s6724.
Change the backData1's content "password:.*" as "assword:.*"(VeryImport,changed all of the python module)
The following was the s6724 response, it uses the "Password" with a big "P".

"buffer (last 100 chars): 'User Authentication\r\r\nPassword: '
before (last 100 chars): 'User Authentication\r\r\nPassword: '"