enhancement(Cloud Databases): add support for User types, roles

[alexhemard]

Adds support for multiple user types (database, ops_manager, read_only_replica) for the IBM Database Resource
See https://cloud.ibm.com/apidocs/cloud-databases-api/cloud-databases-api-v5#createdatabaseuser

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Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccIBMMongoDBEnterprise'
...
--- PASS: TestAccIBMMongoDBEnterpriseDatabaseInstanceGroupBasic (5207.81s)
--- PASS: TestAccIBMMongoDBEnterpriseDatabaseInstanceBasic (27551.47s)
...
$ make testacc TESTARGS='-run=TestAccIBMDatabaseInstance'
...
--- PASS: TestAccIBMDatabaseInstanceElasticsearchImport (465.51s)
--- PASS: TestAccIBMDatabaseInstanceEtcdImport (870.41s)
--- PASS: TestAccIBMDatabaseInstanceMongodbBasic (1534.00s)
--- PASS: TestAccIBMDatabaseInstanceMongodbImport (1152.09s)
--- PASS: TestAccIBMDatabaseInstancePostgresBasic (2373.14s)
--- PASS: TestAccIBMDatabaseInstancePostgresGroup (2593.68s)
--- PASS: TestAccIBMDatabaseInstancePostgresImport (944.31s)
--- PASS: TestAccIBMDatabaseInstancePostgresNode (2270.03s)
--- PASS: TestAccIBMDatabaseInstanceRabbitmqImport (809.02s)
--- PASS: TestAccIBMDatabaseInstanceRedisImport (661.52s)
--- PASS: TestAccIBMDatabaseInstance_Cassandra_Group (6637.37s)
--- PASS: TestAccIBMDatabaseInstance_Cassandra_Node (4408.87s)
--- PASS: TestAccIBMDatabaseInstance_Elasticsearch_Basic (854.69s)
--- PASS: TestAccIBMDatabaseInstance_Elasticsearch_Group (1522.81s)
--- PASS: TestAccIBMDatabaseInstance_Elasticsearch_Node (789.75s)
--- PASS: TestAccIBMDatabaseInstance_Etcd_Basic (873.66s)
--- PASS: TestAccIBMDatabaseInstance_Rabbitmq_Basic (1422.83s)
--- PASS: TestAccIBMDatabaseInstance_Redis_Basic (705.72s)
...

[hkantare]

The doc for database datasource is not updated website/docs/d/database.html.markdown

Please share the testresults of all the testcases...

[alexhemard]

The doc for database datasource is not updated website/docs/d/database.html.markdown

Removed the changes to the ibm_database data source but updated the documentation since it currently seems to imply it will create a Read-only replica

[hkantare]

Can you reabse the PR with respective to new folder structure

[obai-1]

@hkantare since all the comments on this PR are addressed, I will go ahead and merge it. Pls let me know any objections.