[PMON] Skip chassis_db_init task on Mellanox simx platform

[keboliu]

Signed-off-by: Kebo Liu [email protected]

Why I did it

"chassis_db_init" task of PMON should be skipped on Mellanox simx platform, since the hardware info which this task is trying to access is not available on simx platforms, It will introduce some error log.

How I did it

1. Add the capability for "chassis_db_init" in the template for it can be skipped by adding configuration in "pmon_daemon_control.json".
2. add "skip_chassis_db_init" configuration for simx platforms.
3. use symbol link for "pmon_daemon_control.json" since all the simx platforms share the same configuration

How to verify it

Build an image and install it on simx platform to check whether "chassis_db_init" task is skipped.

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)