Refactor devices model

hyperglass/configuration/models/credential.py

@@ -0,0 +1,14 @@
+"""Validate credential configuration variables."""
+
+# Third Party
+from pydantic import SecretStr, StrictStr
+
+# Project
+from hyperglass.models import HyperglassModel
+
+
+class Credential(HyperglassModel):
+    """Model for per-credential config in devices.yaml."""
+
+    username: StrictStr
+    password: SecretStr