security/py-netmiko: Update to 3.3.1

Changelog:

New Drivers/Platforms

• UnifiSwitchSSH
• Huawei OLT
• Huawei SmartAX

Bugfixes and Improvements:

• Nokia SR-OS SCP Support
• Improve terminal width behavior
• Fix some issues related to cmd_verify
• Expanded autodetect support

https://github.com/ktbyers/netmiko/releases/tag/v3.1.1

MFH: 2020Q2