opsworks: implement create_stack

moto/backends.py

@@ -12,6 +12,7 @@ from moto.elb import elb_backend
 from moto.emr import emr_backend
 from moto.glacier import glacier_backend
 from moto.iam import iam_backend
+from moto.opsworks import opsworks_backend
 from moto.kinesis import kinesis_backend
 from moto.kms import kms_backend
 from moto.rds import rds_backend
@@ -36,6 +37,7 @@ BACKENDS = {
     'emr': emr_backend,
     'glacier': glacier_backend,
     'iam': iam_backend,
+    'opsworks': opsworks_backend,
     'kinesis': kinesis_backend,
     'kms': kms_backend,
     'redshift': redshift_backend,