onepassword lookup - Make section and field case insensitive (#7564)

* onepassword lookup: Make section and field case insensitive

This was a regression in behavior when adding support for op v2.

* Return a string by default to avoid an exception if a field is missing

* Use a helper function to lower a value if possible

* Update changelog

tests/unit/plugins/lookup/onepassword_common.py

@@ -107,7 +107,7 @@ MOCK_ENTRIES = {
             "queries": ["Omitted values"],
             "kwargs": {
                 "field": "section-label-without-value",
-                "section": "section-without-values"
+                "section": "Section-Without-Values"
             },
             "expected": [""],
             "output": load_file("v2_out_04.json")

tests/unit/plugins/lookup/onepassword_fixtures/v2_out_01.json

@@ -13,10 +13,10 @@
     "additional_information": "Jan 18, 2015, 08:13:38",
     "fields": [
         {
-            "id": "password",
+            "id": "Password",
             "type": "CONCEALED",
             "purpose": "PASSWORD",
-            "label": "password",
+            "label": "Password",
             "value": "OctoberPoppyNuttyDraperySabbath",
             "reference": "op://Test Vault/Authy Backup/password",
             "password_details": {