Taken from #1081

* Update sonic-sairedis for Nephos.

Signed-off-by: Wade He <chihen.he@gmail.com>

- What I did
Add Nephos information into README.md
Update content of npx_diag from binary to shell

- How I did it

- How to verify it
Check npx_diag work as well

- Description for the changelog
Update REAME and diag utility for Nephos

Signed-off-by: Sam Yang <yang.kaiyu@gmail.com>

)

- What I did
    Separate led and port config file from SAI debian package of Nephos

- How I did it
    The modification is as below:
    1. port config
       old path: /etc/nps/tau-s9130-32x100G.dsh
       new path: /usr/share/sonic/hwsku/port_config.nps
    2. led config
       old path: /etc/nps/tau-s9130-32x100G.cfg
       new path: /usr/share/sonic/platform/led_proc_init.nps

- How to verify it
    After the config files are separated, check switch interfaces and network features are work as well

- Description for the changelog
    Separate led and port config file from SAI debian package of Nephos

Signed-off-by: Sam Yang <yang.kaiyu@gmail.com>

…ni (#1176)

- What I did
    Update index value from 1-based to 0-based

- How I did it
    The below files will be modified:
    1. port_config.ini
    2. sfputil.py

- How to verify it
    Execute command "sfputil show eeprom" to check the eeprom can be dumped if port is pluggged.

- Description for the changelog
    Update index value from 1-based to 0-based

Signed-off-by: Sam Yang <yang.kaiyu@gmail.com>