[Bug]: Tests executing TSA/TSB on chassis supervisor cards should be updated to match new logic

[Javier-Tan]

Issue Description

Tests that execute TSA/TSB on chassis supervisor cards are testing on old logic where after executing TSA/TSB, they are expecting the password to the LCs to perform rexec commands on LCs.

New logic does not require this, and the tests should be updated as such. E.g.

admin@sonic:~$ sudo TSB
Chassis is already in Normal mode
Please execute 'sudo config save' to preserve System mode in Normal state after reboot  or config reload on all linecards
admin@sonic:~$ sudo TSB
True
Chassis Mode: Maintenance -> Normal
Please execute 'sudo config save' to preserve System mode in Normal state after reboot  or config reload on all linecards

Namely tests in test_traffic_shift_sup.py and test_startup_tsa_tsb_service.py

Results you see

Tests fail and exception raised for testcases that run TSA/TSB chassis supervisor cards.

Results you expected to see

Tests should expect the correct output after executing TSA or TSB.

Is it platform specific

generic

Relevant log output

N/A

Output of show version

Version agnostic

Attach files (if any)

N/A

[Javier-Tan]

@arlakshm