Support lists validation in resources schema definition #3641
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Supports lists validation in resources schema definition.
The motivation of this change is to check that there are not multiple definitions of health checks in AWS ELBs.
Currently terraform allows to define several health checks, but an ELB can only have one health check and only the first one is used, ignoring the rest without any warning. A developer can think that all the health checks are being configured, but only the first one is created at the end.