Add userpass and LDAP support for HashiCorp vault credential_plugin #8116

Job	Run time
awx-operator	17m 54s
dev-env	4m 58s
api-test	5m 23s
api-migrations	6m 10s
api-lint	1m 43s
api-swagger	3m 36s
awx-collection	1m 58s
awx_collection integration (a-h, ^[a-h])	10m 37s
api-schema	6m 0s
awx_collection integration (i-p, ^[i-p])	12m 36s
ui-lint	2m 45s
awx_collection integration (r-z0-9, ^[r-z0-9])	10m 17s
ui-test-screens	7m 48s
ui-test-general	4m 13s
awx_collection sanity	1m 11s
combine awx_collection integration coverage	5m 35s
	1h 42m 44s

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