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.