[bug] Remove vpnCACrt and rename vpnCaKey to be providerCaKey.
vpnCaCrt and vpnCaKey are the ca keypair used to sign the vpn certificates, which is the same CA as providerCaCert which is the API endpoint CA, which is the one provided at /ca.crt.
vpnCaCrt and vpnCaKey are the ca keypair used to sign the vpn certificates, which is the same CA as providerCaCert which is the API endpoint CA, which is the one provided at /ca.crt.