[FSSDK-11399] support traffic allocation for cmab #1130

Job	Run time
lint	1m 9s
crossbrowser_and_umd_unit_tests	6h 0m 12s
unit_tests (16)	1m 20s
unit_tests (18)	1m 18s
unit_tests (20)	1m 10s
unit_tests (22)	1m 6s
integration_tests / test	5s
lint_markdown_files / lint	49s
fullstack_production_suite / test	5s
Coveralls coverage	0s
	6h 7m 14s

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