GH-1517: added configuration for multiple customizer for ContainerMessageListener

[rfelgent]

This PR is for #1517

[pivotal-cla]

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[rfelgent]

I am unable to sign the contribute license agreement for my company, as there is no selection item of github organisation.
but this field is required to proceed.
pls help.

[ilayaperumalg]

@rfelgent Sorry for the inconvenience. Could you tell us if you are trying to sign as Individual CLA or Corporate CLA?

[rfelgent]

Corporate CLA

[artembilan]

@rfelgent ,

OK. Tell us, please, then what is wrong with this link to follow:

?

[rfelgent]

The link itself works . The company / github organisation drop down selection has no items. the field is required.

I cant find the mis-configuration / problem on my side...

[ilayaperumalg]

@rfelgent I checked with @rwinch and he suggested to check if you have made your membership public as outlined in "How Do I Link My Signature to a GitHub Organization?" https://cla.pivotal.io/about#corporate-signature-github-org ?

[pivotal-cla]

@rfelgent Thank you for signing the Contributor License Agreement!

[rfelgent]

Hello @ALL,

thanks for your support. I found the mis-configuration on my side. Thanks again.

I signed the Corporate CLA

[garyrussell]

Thanks for the contribution; looking forward to more; merged as aa86a02 (please limit commit headlines to 50 chars in future).

With polishing, test and docs here b9b83f9

[garyrussell]

...and cherry-picked to 2.4.x.

[rfelgent]

thank you very much for your support (checkstyle, documentation and so on) @garyrussell