Update path to container cert and key.
Diego's instance identity system provides each app container with a
certificate and private key in the standard locations
-`/etc/cf-instance-identity/instance.crt` and
-`/etc/cf-instance-identity/instance.key`, respectively. The absolute path of
+`/etc/cf-instance-credentials/instance.crt` and
+`/etc/cf-instance-credentials/instance.key`, respectively. The absolute path of
the certificate and private key are also present in the environment variables
`CF_INSTANCE_CERT` and `CF_INSTANCE_KEY`.
