systemd: Add host identifier to service description

On a multi-host system, there is no identifier for the post code manager
service, so you end up with console messages such as:

```
Start

systemd: Add host identifier to service description

On a multi-host system, there is no identifier for the post code manager
service, so you end up with console messages such as:

```
Starting Post code manager...
Starting Post code manager...
Starting Post code manager...
Starting Post code manager...
Starting Post code manager...
Starting Post code manager...
Starting Post code manager...
Starting Post code manager...
```

Add an identifier to the templated service file so that these instances
are differentiated.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I63c0a5d80f4870314805b8f9ff07782be9fe3faf

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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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phosphor-post-code-manager: Add post code support for multi host

Added implementation to handle post codes from multiple host to BMC with
multi process approach. Each process handles post codes for

phosphor-post-code-manager: Add post code support for multi host

Added implementation to handle post codes from multiple host to BMC with
multi process approach. Each process handles post codes for corresponding host.

TESTED : Built the openbmc image targetting Facebook YosemiteV2 hardware.
Verified all the host's postcodes stored in corresponding host directories.

Signed-off-by: Kumar Thangavel <thangavel.k@hcl.com>
Change-Id: I29d55558ed165d9e4494f017e13808dff6252b04

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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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