Add support for post code handling/eventing

Add support to consume a JSON configuration which
will let a platform configuration to dictate if
we need to do special handling or logging based
on speci

Add support for post code handling/eventing

Add support to consume a JSON configuration which
will let a platform configuration to dictate if
we need to do special handling or logging based
on specific post codes received.

Tested:

1. Created the following config and after restarting
`xyz.openbmc_project.State.Boot.PostCode@0.service`:
```
[
{
"primary": [1,2,5],
"event": {
"name": "xyz.openbmc_project.State.SMC.SMCFailed",
"arguments": {
"IDENTIFIER": "test",
"FAILURE_TYPE": "world"
}
}
}
]
```

Created the primary post code:
```
root@bmc:~# busctl set-property xyz.openbmc_project.State.Boot.Raw /xyz/openbmc_project/state/boot/raw0 xyz.openbmc_project.State.Boot.Raw Value '(ayay)' 3 0x1 0x2 0x5 0x0
```
Check that the log is created:
```
root@bmc:~# busctl introspect -l xyz.openbmc_project.Logging /xyz/openbmc_project/logging/entry/2 xyz.openbmc_project.Logging.Entry | grep "AdditionalData\|Message"
.AdditionalData property a{ss} 6 "FAILURE_TYPE" "world" "IDENTIFIER" "test" <snip>
.Message property s "xyz.openbmc_project.State.SMC.SMCFailed"
```
2. Replace the config with:
```
[
{
"primary": [1,2,6],
"targets": ["testservice.service"]
}
]
```
Create a test unit file:
testservice.service:
```
[Unit]
Description=A simple oneshot service

[Service]
Type=oneshot
ExecStart=/bin/bash -c "echo Hello world > /tmp/test.txt"
```
Issue a new post code with the new config.
```
systemctl daemon-reload
systemctl restart xyz.openbmc_project.State.Boot.PostCode@0.service
root@bmc:/usr/lib/systemd/system# busctl set-property xyz.openbmc_project.State.Boot.Raw /xyz/openbmc_project/state/boot/raw0 xyz.openbmc_project.State.Boot.Raw Value '(ayay)' 3 0x1 0x2 0x5 0x0
root@bmc:/usr/lib/systemd/system# cat /tmp/test.txt
Hello world
```

Change-Id: Ibaa09fb88190a344fd7c4fadd24dda4aa4ae0633
Signed-off-by: Amithash Prasad <amithash@meta.com>

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Update D-Bus names per design

- Single-host service and object are named PostCode0. Multi-host service
name does not comply with design but presumably it will be fixed in
the future.

Tested: Wi

Update D-Bus names per design

- Single-host service and object are named PostCode0. Multi-host service
name does not comply with design but presumably it will be fixed in
the future.

Tested: With
phosphor-host-postd: I89ab5f2eef7eab59823df3a063414f3ca3b2949f
bmcweb: I2fdf97b7aaf8d6471d162f8ed1b72143491ac23f
Power cycled host and verified that new POST codes are added under
/redfish/v1/Systems/system/LogServices/PostCodes/Entries.

Signed-off-by: Jonathan Doman <jonathan.doman@intel.com>
Change-Id: I59ed514f28c2bb9b159f51367c38557bf55bf226

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Change obmc-standby to multi-user

Change obmc-standby.target to multi-user.target for post code manager service.

Tested:
Post code could be catured correctly.

Change-Id: I3686104f67aad13fa4d5f5d38

Change obmc-standby to multi-user

Change obmc-standby.target to multi-user.target for post code manager service.

Tested:
Post code could be catured correctly.

Change-Id: I3686104f67aad13fa4d5f5d382d3eb7dd8b9a74f
Signed-off-by: Kuiying Wang <kuiying.wang@intel.com>

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Implement post code manager

This depends on interfaces definition:
https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-dbus-interfaces/+/20474

Implement method and properties defined in PostCode.

Implement post code manager

This depends on interfaces definition:
https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-dbus-interfaces/+/20474

Implement method and properties defined in PostCode.interface.yaml
under phosphor-dbus-interfaces/xyz/openbmc_project/State/Boot
1. Method: std::vector<uint64_t> PostCode::getPostCodes(uint16_t index)
2. Properties: CurrentBootCycleIndex/MaxBootCycleNum

Test-By:
Every cycle post codes is saved in "/var/lib/phosphor-post-code-manager"
"1" file is saved all post codes for cycle 1
"2" file is saved all post codes for cycle 2
"CurrentBootCycleIndex" file is saved the current boot cycle number.
root@wolfpass:/var/lib/phosphor-post-code-manager# ls
1 2 CurrentBootCycleIndex

Change-Id: Ia89b9121983261fef5573092d890beb84626ceeb
Signed-off-by: Kuiying Wang <kuiying.wang@intel.com>

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