Use field selector to get ASM configmap

[linxiulei]

Doing so avoids caching unneeded configmaps in memory.

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[aojea]

/ok-to-test
/lgtm
/assign @bowei

Thanks

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, linxiulei

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[swetharepakula]

Out of curiosity, did we see that there was a large configmap memory usage after changing to just the ASM namespace?

[linxiulei]

Out of curiosity, did we see that there was a large configmap memory usage after changing to just the ASM namespace?

No, not in practice. This PR is more of a cleanup than an optimization.