paas-s3-broker: bump to ..., provide with common user policy, expand custom-broker-acceptance-tests #2583

Job	Run time
tests (lint)	2m 44s
tests (config_spec)	49s
tests (tools_spec)	2m 22s
tests (concourse_spec)	1m 56s
tests (manifests_spec)	4m 15s
tests (terraform_spec)	1m 26s
tests (platform_tests_spec)	1m 19s
tests (compile_platform_tests)	1m 13s
	16m 4s

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