Title: #1948: ipa vault-archive overwrites an existing value without warning
Upstream ticket was raised for issuing an warning message
whenever data in ipa vault is overwritten.
In Bugzilla(1339129) its agreed upon that Current behavior is consistent
with other IPA commands. None of ipa mod commands asks for confirmation
and therefore it should be the same here.
But to document, that vault can contain only one value in ipa help vault.
This PR addresses the changes agreed in Bugzilla.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/1948/head:pr1948
git checkout pr1948