k8s: remove token signer from k8s config #164

Job	Run time
build_and_push_as_image / build_as_image (x86_64, RESTful CoCo-AS)	6m 31s
build_and_push_as_image / build_as_image (x86_64, gRPC CoCo-AS)	6m 28s
build_and_push_as_image / build_as_image (x86_64, RVPS)	2m 47s
build_and_push_as_image / build_as_image (s390x, RESTful CoCo-AS)	11m 2s
build_and_push_as_image / build_as_image (s390x, gRPC CoCo-AS)	5m 21s
build_and_push_as_image / build_as_image (s390x, RVPS)	3m 33s
build_and_push_as_image / build_as_image (aarch64, RESTful CoCo-AS)	6m 18s
build_and_push_as_image / build_as_image (aarch64, gRPC CoCo-AS)	6m 46s
build_and_push_as_image / build_as_image (aarch64, RVPS)	2m 59s
publish_multi_arch_image (coco-as-grpc)	9s
publish_multi_arch_image (coco-as-restful)	9s
publish_multi_arch_image (rvps)	17s
	52m 20s

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