mgr/dashboard: add patch that removes PyOpenSSL-related usages

mgr/dashboard: add patch that removes PyOpenSSL-related usages

This patch allows the dashboard to work again with TLS enabled; it
however disables the possibility to create self-signed certs via the
`ceph` CLI. This means that users will have to supply the correct
key/cert pair themselves, which are just a few extra steps instead. [0]

Users that try to generate a self-signed cert via the `ceph` CLI are
instead provided with instructions on how to generate and configure a
key/cert pair themselves.

Additionally, the check whether the cert and key match is removed during
the dashboard's launch.

See the patch for additional details.

[0]: https://docs.ceph.com/en/reef/mgr/dashboard/#ssl-tls-support

Signed-off-by: Max Carrara <m.carrara@proxmox.com>