- Why I did it
When PSU is powered off, the PSU is still on the switch and the air flow is still the same. In this case, it is not necessary to set FAN speed to 100%.
- How I did it
When PSU is powered of, don't treat it as absent.
- How to verify it
Adjust existing unit test case
Add new case in sonic-mgmt
#### Why I did it
According to thermalctld hld, each fan must belong to a fan drawer, if the fan drawer does not physically exist, put fan into a virtual fan drawer. This PR is to clear fan from chassis._fan_list
#### How I did it
1. Don't put fan to chassis._fan_list
2. Always query fan from fan_drawer
**- Why I did it**
After migrating to python3, the operator '/' always get a float result, but it gets integer result in python2. Need fix this in thermal_conditions.
**- How I did it**
1. cast float value to int
2. change the unit test case to cover this situation
**- How to verify it**
Manually test and regression test
In order to support SONiC physical entity mib extension, a few new platform API are added to sonic-platform-common, this PR is to provide an mellanox platform implementation for those new APIs.
* [thermal control] Fix pmon docker stop issue on 3800
* [thermal fix] Fix QA test issue
* [thermal fix] change psu._get_power_available_status to psu.get_power_available_status
* [thermal fix] adjust log for PSU absence and power absence
* [thermal fix] add unit test for loading thermal policy file with duplicate conditions in different policies
* [thermal] fix fan.get_presence for non-removable SKU
* [thermal fix] fix issue: fan direction is based on drawer
* Fix issue: when fan is not present, should not read fan direction from sysfs but directly return N/A
* [thermal fix] add unit test for get_direction for absent FAN
* Unplugable PSU has no FAN, no need add a FAN object for this PSU
* Update submodules
Co-authored-by: Stephen Sun <5379172+stephenxs@users.noreply.github.com>
