[YANGTOOLS-1307] Correctly tag missing key violations

Blocks — Thu, 18 Jan 2024 10:42:40 +0000

RFC6020 section 8.3.1 provides guidance as to what error-tag should be reported when we are missing a key leaf in a list during parsing:

      If all keys of a list entry are not present, the server MUST reply
      with a "missing-element" error-tag in the rpc-error.

Add the appropriate exception and YangNetconfError awareness so that it may be decoded by users.

OpenDaylight JIRA