PEL: Support 'PossibleSubsystems' in msg registry

Add a 'PossibleSubsystems' field to the message registry schema where
someone can list which subsystems they might pass into the PEL_SUBSYSTEM
Addit

PEL: Support 'PossibleSubsystems' in msg registry

Add a 'PossibleSubsystems' field to the message registry schema where
someone can list which subsystems they might pass into the PEL_SUBSYSTEM
AdditionalData property field when creating a PEL.

The PossibleSubsystems value will be used by a off-BMC script that
generates field documentation for SRCs, so it knows what all SRC ASCII
string values are possible for that entry since the subsystem is part of
them. For example, if that field was ['processor', 'memory'], then that
means the possible SRCs are BD10AAAA and BD20AAAA for reason code
'AAAA'.

The Subsystem and PossibleSubsystems fields are mutually exclusive in
the message registry, so code changes had to be made to support the
subsystem field now being optional.

There is now a chance that even though the subsystem is supposed to be
passed in using PEL_SUBSYSTEM, it isn't. In that case, the 'Other'
subsystem will be used, since it seems fairly generic.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: Ic8087fc46b2a192459b7287186f8972610e84730

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PEL: Add license prologue to test source files

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I67c62ab5ac6e69ad0a84937834581f9a280a9167

PEL: Represent the SRC ASCII string field

In the SRC section of a PEL, there is a field called the 'ASCII string'.
This is the string of 32 characters that shows up on the panel when the

PEL: Represent the SRC ASCII string field

In the SRC section of a PEL, there is a field called the 'ASCII string'.
This is the string of 32 characters that shows up on the panel when the
SRC function is chosen, and usually when people refer to an SRC, the
first 8 characters of this field is what they are referring to.

This new class handles that string. It will belong to the SRC section
object.

For BMC error SRCs, it looks like: BDSSRRRR
Where:
BD = "BD", indicating a BMC error SRC
SS = subsystem value from PEL spec
RRRR = reason code of the error

The remaining 24 characters are spaces (' ').

For example:
"BD8D1234 "

For BMC power* related errors, the value is:

"11001234 "

Where the difference is the "11" instead of "BD", and the following
2 bytes are always "00".

* 'power' means comes from the repository that monitors for power
faults. This is different purely to help keep field service
documentation the same as in previous IBM server generations.

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I6e7292e7f5b501428999781b1a5ee5c243a63ac6

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