Disable linting for hard-coded creds in *_test.go

Author: johnsaigle

.golangci.yml

@@ -237,6 +237,10 @@ linters:
           - nolintlint
           - prealloc
         path: _test\.go
+      - linters:
+          - gosec
+        path: _test\.go
+        text: 'G101'
       - linters:
           - exhaustruct
         path: (?i).*mock.*