tree 0651b3c86dcfd7f5f7b99542d92fd27288f6005a
parent ad90ad5120620e0c6f9e690f4b7bf5eef633d05d
author Lei YU <mine260309@gmail.com> 1565240990 +0800
committer Lei YU <mine260309@gmail.com> 1565919941 +0800

Handle PSU inventory changes

Watch the PSU inventory property changes, so that when a PSU is plugged
out/in, the software object is removed or created.
If mutliple PSUs have the same software version, the related
associations are updated.

Tested: On Witherspoon, manually setting PSU's present property to false
        and true, when both PSUs have the same version.
        0. Before setting PSU's present false, verify the software
        object is associated with two PSUs;
        1. When one of the PSU is set false, verify the assocation is
        removed and only one PSU path is associated;
        2. When both of the PSUs are set false, verify the software
        object is removed;
        3. When a PSU is set to true, verify the software object is
        created and associated with the PSU;
        4. When the other PSU is set to true, verify the software object
        is associated with both PSUs.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I417a87bf57c01aa57f78f09b7abc4e948a4d1752