BUGFIX: Remove account management API calls

Developer API keys don't have the privileges required to get information about their owners. To correct for this, remove user name reporting and use the API key `owner_id` directly.

Fixes: IOTAUTH-1686

Author: bremoran

tools/device_management.py

@@ -85,15 +85,14 @@ def inner(options):
         api_key = accounts.list_api_keys(filter={
             'key': getenv("MBED_CLOUD_SDK_API_KEY")
         }).next()
-        user = accounts.get_user(api_key.owner_id)
         certificates_owned = list(certs.list_certificates())
         dev_cert_info = None
         for certif in certificates_owned:
-            if certif.type == "developer" and (certif.owner_id == user.id or
+            if certif.type == "developer" and (certif.owner_id == api_key.owner_id or
                                                certif.owner_id == api_key.id):
                 dev_cert_info = certs.get_certificate(certif.id)
-                LOG.info("Found developer certificate onwed by %s named %s",
-                         user.full_name, dev_cert_info.name)
+                LOG.info("Found developer certificate named %s",
+                         dev_cert_info.name)
                 break
         else:
             LOG.warning(