[FSSDK-11399] support traffic allocation for cmab #1129

Job	Run time
crossbrowser_and_umd_unit_tests	6h 0m 13s
lint	1m 20s
unit_tests (16)	1m 22s
unit_tests (18)	1m 19s
unit_tests (20)	1m 15s
unit_tests (22)	1m 11s
fullstack_production_suite / test	6s
integration_tests / test	5s
lint_markdown_files / lint	53s
Coveralls coverage	0s
	6h 7m 44s

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