Add enterprise subsidy to devstack #613

Job	Run time
run_ci (ubuntu-20.04, 3.11, discovery+lms+forum)	26m 52s
run_ci (ubuntu-20.04, 3.11, registrar+lms)	17m 6s
run_ci (ubuntu-20.04, 3.11, ecommerce+lms)	21m 44s
run_ci (ubuntu-20.04, 3.11, edx_notes_api+lms)	16m 44s
run_ci (ubuntu-20.04, 3.11, credentials+lms)	17m 34s
run_ci (ubuntu-20.04, 3.11, xqueue)	2m 59s
run_ci (ubuntu-20.04, 3.11, analyticsapi+insights+lms)	23m 22s
run_ci (ubuntu-20.04, 3.11, designer+lms)	17m 39s
run_ci (ubuntu-20.04, 3.11, enterprise-subsidy+enterprise-catalog+enterprise-access+lms)	23m 58s
run_ci (ubuntu-20.04, 3.11, license-manager+lms)	17m 23s
	3h 5m 21s

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