tree 158c1861839987aa2774464f159217adb7110a28
parent 64e9775d13e265380d7eb55d4ea96d4feb7168cb
author Shawn McCarney <shawnmm@us.ibm.com> 1654883258 -0500
committer Shawn McCarney <shawnmm@us.ibm.com> 1655183044 -0500

psu-ng: Only log missing errors for required PSUs

If a power supply unit (PSU) is missing, only log an error if it is
required by the current SupportedConfiguration.

EntityManager provides one or more D-Bus objects that implement the
SupportedConfiguration interface.  This interface specifies a PSU model,
input voltage, and required number of PSUs.

EntityManager also provides one or more D-Bus objects that represent
possible PSU devices that could exist in the system.

If the number of required PSUs is less than the number of possible PSUs,
it is not an error for the extra PSUs to be missing.

Add logic to the power supply monitoring application to determine if a
missing PSU is required before logging an error.

Tested:
* Test plan documented at
  https://gist.github.com/smccarney/ba99ac808503b477aa056e7f4afe2ae1

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I2e8d147ad88461077da497b26fcc309966e04b45