Fix issues to support custom SAI header

[Junchao-Mellanox]

Why I did this

SAI starts to support customer SAI header a few months ago. During integration with custom SAI header, I found some issues. This PR is to fix them. The PR also add a custom flag to VID and RID.

How I did this

1. sonic-sairedis should compile with custom headers
2. sonic vs sai should install custom headers to /usr/bin/sai
3. add a custom flag in VID and RID

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Junchao-Mellanox]

/azpw run Azure.sonic-sairedis

[mssonicbld]

/AzurePipelines run Azure.sonic-sairedis

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Junchao-Mellanox]

Hi @kcudnik , checker failed due to "/usr/bin/ld: final link failed: No space left on device", could you please suggest who can provide help?

[kcudnik]

Hi @kcudnik , checker failed due to "/usr/bin/ld: final link failed: No space left on device", could you please suggest who can provide help?

im no longermember of this project, plese ask Guohan

[Junchao-Mellanox]

@saiarcot895 , could you please suggest who can handle the checker issue?

[Junchao-Mellanox]

/azpw run Azure.sonic-sairedis

[mssonicbld]

/AzurePipelines run Azure.sonic-sairedis

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Junchao-Mellanox]

Hi @lguohan , could you please suggest who may help review this PR? Thanks!

[lguohan]

what is the use case for custom SAI header? can you help to elaborate more?

[Junchao-Mellanox]

what is the use case for custom SAI header? can you help to elaborate more?

Hi @lguohan , it is an existing feature is SAI opencomputeproject/SAI@6168071. The readme file described the feature well:

SAI/custom is designed to hold custom headers provided by vendors.

By default this directory is empty, and no custom headers are present.  If
vendor want to provide custom headers, it can just simply copy custom headers
to that directory, and automatically that directory will be used by meta parser
to generate metadata for custom headers as well.

There is requirement that custom headers must still follow style convention
as regular headers.

This directory SAI/doc/custom-headers contains sample custom headers and how
they should look like. Base file is saicustom.h file which must be present if
vendor wants to add custom headers.

Custom headers, can extend existing object type, api, stats, attributes and
provide new apis and totally new enums.

Examing provided examples in this directory. If there will be problem with
custom headers, meta parser will provide error/warning message