[202305] Revert LPM test due to design change back and fix some LPM test issue

[JibinBao]

Description of PR

Summary:

1. Revert LPM test, because the implementation has been reverted to the old way.[Mellanox] Revert LPM implementation to the old way sonic-buildimage#17096
2. Fix issue of test_check_sfputil_low_power_mode. Previously after setting the lpmode, test checks the value is on or off, which is not correct. we should check if the value of lpmode is the set one.
3. When the cable type is OSPF and the power class is not "Power Class 1", it also supports LPM. So, add a check accordingly.

Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 201911
• 202012
• 202205
• 202305

Approach

What is the motivation for this PR?

Revert lpm test

How did you do it?

Revert lpm test

How did you verify/test it?

Run lmp test on image inlcuding sonic-net/sonic-buildimage#17096

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[liat-grozovik]

if you cannot take the master PR to 202305 with clean cherrypick can you please refer to the master PR for tracking?
also does not seems it is only revert. can you explain the motivation of the fix and the additional changes done?

[JibinBao]

if you cannot take the master PR to 202305 with clean cherrypick can you please refer to the master PR for tracking? also does not seems it is only revert. can you explain the motivation of the fix and the additional changes done?

@liat-grozovik .
Thank you for your comments.

1. master PR: Revert LPM test due to design change back and fix some LPM test issues #10903
2. I have updated the description.

[liat-grozovik]

@yxieca can you please help to merge to release branch?