switch-configuration flashing works more consistently on linux

[sarcasticadmin]

Description

Currently being worked on in od_pre22x_01 branch

Problem include:

• -t being able to be used for IP/Name and not just serial. When used for serial, it does need a switch_spec in some use cases

Fixes include:

• add a check that marks -l and -t incompatible

Suggested argument combos include:

• switch_config_loader -c miniconfig -p -t /dev/<tty_device> -u <user> for serial
• switch_config_loader -l -u <user> for IP

Acceptance Criteria

• switch_config_loader works in serial and IP scenarios on linux
• Documentation around the process is updated to reflect actual behavior

[sarcasticadmin]

@davidelang @KN6VKN

[davidelang]

note, the script requires that it be run as root to be able to ping, but then needs access to the user ssh keys to authenticate. I worked around that by copying my personal key to the root .ssh directory

Also, it requires a hosts entry for every switch mapping to 192.168.255.76

after I did that, I was able to run it and it appears to identify and flash the switches. But it generates some expect errors, see attached switchconfig.log file
switchconfig.log

[davidelang]

running as dlang no sudo

icmp ping requires root privilege at scripts/Loader.pm line 129.

wihtout the /etc/hosts change
detect_switch returned Expo-Catwalk
Processing Expo-Catwalk as 192.168.255.76 with
Calling (Loader) override_switch for Expo-Catwalk at 192.168.255.76 () with
Looking up switch Expo-Catwalk
get_switchtype called for Expo-Catwalk.
Returning: (Expo-Catwalk, 6, 103, 2001:470:f026:103::200:6, Catwalk, W, 1, Loud, ex4200-48p, 00:26:88:7d:d3:7f)
Got Entry: Expo-Catwalk, 6, 103, 2001:470:f026:103::200:6, Catwalk for Expo-Catwalk
Sending configuration file (output/Expo-Catwalk.conf) to Expo-Catwalk
Initializing SFTP connection to expo-catwalk.scale.lan with user dlang
ssh: Could not resolve hostname expo-catwalk.scale.lan: Name or service not known
SFTP Put output/Expo-Catwalk.conf
Failed to send config to expo-catwalk.scale.lan (Expo-Catwalk)
at ./scripts/switch_config_loader line 268.