Bug Fix - ops_manager User Creation

[omaraibrahim]

ops_manager User Creation broke after the user management refactor in this PR: ad38584

This bug fix is meant to bring back ops_manager user creation.

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TEST=./ibm/service/database TESTARGS='-run=TestAccIBMMongoDBShardingDatabaseInstanceBasic'
--- PASS: TestAccIBMMongoDBShardingDatabaseInstanceBasic (2892.46s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/database	2897.485s
...

make testacc TEST=./ibm/service/database TESTARGS='-run=TestAccIBMDatabaseInstancePostgresBasic'
--- PASS: TestAccIBMDatabaseInstancePostgresBasic (1134.99s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/database	1140.039s

make testacc TEST=./ibm/service/database TESTARGS='-run=TestAccIBMMongoDBEnterpriseDatabaseInstanceBasic'
--- PASS: TestAccIBMMongoDBEnterpriseDatabaseInstanceBasic (8791.58s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/database	8796.480s

[obai-1]

Has this been tested with MongoDBEE? Could you please add a test to cover that as well?