This change refactors tls-certificates relation handler.
List of changes:
- Allow management of multiple tls certificates on the same relation
- Allow easier override of certificate signing request (csr)
- Enable certificate renewal on expiration / revokation
- Upgrade tls-certificates relation from v1 to v3
Change-Id: I4f6ac6a5570635388cc10131b34fbc6b422e1bca
Signed-off-by: Guillaume Boutry <guillaume.boutry@canonical.com>
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