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
(cherry picked from commit 241cc02fa8)
Co-authored-by: Sam Doran <sdoran@redhat.com>
