[FSSDK-11399] support traffic allocation for cmab #1135

Job	Run time
crossbrowser_and_umd_unit_tests	6h 0m 13s
lint	1m 12s
unit_tests (16)	2m 7s
unit_tests (18)	1m 57s
unit_tests (20)	1m 47s
unit_tests (22)	1m 41s
fullstack_production_suite / test	3s
integration_tests / test	4s
lint_markdown_files / lint	1m 5s
Coveralls coverage	3s
	6h 10m 12s

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