Add vault_alicloud_auth_backend_role resource

[lawliet89]

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Fixes #664

Release note for CHANGELOG:

* Add `vault_alicloud_auth_backend_role` resource

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAlicloudAuthBackendRole'

...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test $(go list ./... |grep -v 'vendor') -v -run=TestAlicloudAuthBackendRole -timeout 120m
?   	github.com/terraform-providers/terraform-provider-vault	[no test files]
?   	github.com/terraform-providers/terraform-provider-vault/cmd/coverage	[no test files]
testing: warning: no tests to run
PASS
ok  	github.com/terraform-providers/terraform-provider-vault/util	(cached) [no tests to run]
=== RUN   TestAlicloudAuthBackendRole_basic
--- PASS: TestAlicloudAuthBackendRole_basic (0.24s)
PASS
ok  	github.com/terraform-providers/terraform-provider-vault/vault	(cached)

[lawliet89]

@yongzhang Please give this PR a try if you have the time.

[yongzhang]

@lawliet89 This is great! Thanks for supporting this!!!

[tyrannosaurus-becks]

This looks great! Thanks for working on this. When we've got the errors lower-cased, should be good to go.

[lawliet89]

Made the changes as suggested.

[tyrannosaurus-becks]

Very nice! :-) Thank you!