lighthouse/testing/web3signer_tests/tls/web3signer/cert.pem

Add client authentication to Web3Signer validators (#3170) ## Issue Addressed Web3Signer validators do not support client authentication. This means the `--tls-known-clients-file` option on Web3Signer can't be used with Lighthouse. ## Proposed Changes Add two new fields to Web3Signer validators, `client_identity_path` and `client_identity_password`, which specify the path and password for a PKCS12 file containing a certificate and private key. If `client_identity_path` is present, use the certificate for SSL client authentication. ## Additional Info I am successfully validating on Prater using client authentication with Web3Signer and client authentication. 2022-05-18 23:14:37 +00:00			`-----BEGIN CERTIFICATE-----`
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			`-----END CERTIFICATE-----`