tools: add gen-eventfilter.py

Generate event filtering code for lg2::commit from an input json
file, so that system integrators can create default filtering rules
to omit undesired events and errors

tools: add gen-eventfilter.py

Generate event filtering code for lg2::commit from an input json
file, so that system integrators can create default filtering rules
to omit undesired events and errors from their systems.

Tested:

Used `log-create` to create an event and observed it. Modified the
default event filter as follows and saw log was not created.

```
@@ -3,6 +3,9 @@
"default": "allowed"
},
"errors": {
- "default": "allowed"
+ "default": "allowed",
+ "ids": [
+ "xyz.openbmc_project.State.SMC.SMCFailed"
+ ]
}
}
```

```
$ ./builddir/log-create xyz.openbmc_project.State.SMC.SMCFailed --json '{ "IDENTIFIER": "/xyz/openbmc_project/inventory/SomeSMC", "FAILURE_TYPE": "Timeout for the SMC" }'
```

Change-Id: Ib6041481075758b994bb27a816dbf5e9f26c2841
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

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meson: reformat with meson formatter

Apply the `meson format` results.

Change-Id: I874e2c57075988db53dad8e365c0bf1ac204f81b
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>

lg2: commit: add support for journal-only method

The design document for the new event system references an
option to log events to the journal rather than to dbus[1] using
the 'OPENBMC_MESSAGE_ID'

lg2: commit: add support for journal-only method

The design document for the new event system references an
option to log events to the journal rather than to dbus[1] using
the 'OPENBMC_MESSAGE_ID' identifier. Add support and test cases
for this as a meson option.

[1]: https://github.com/openbmc/docs/blob/master/designs/event-logging.md#phosphor-logging

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6cb94453c6cc95a9ccbbbc11859b70ef12d375fd

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meson_options.txt: Support for reading options from meson.options

Support has been added for reading options from meson.options instead
of meson_options.txt[1]. These are equivalent, but not using t

meson_options.txt: Support for reading options from meson.options

Support has been added for reading options from meson.options instead
of meson_options.txt[1]. These are equivalent, but not using the .txt
extension for a build file has a few advantages, chief among them
many tools and text editors expect a file with the .txt extension to
be plain text files, not build scripts.

[1] https://mesonbuild.com/Release-notes-for-1-1-0.html#support-for-reading-options-from-mesonoptions

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I96388417db1a5c375ad831e6cdf5e7f33b5dd2ae

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