cfssl-certinfo -- output certinfo about the given cert

	Usage of certinfo:
		- Data from local certificate files
        	certinfo -cert file
		- Data from certificate from remote server.
        	certinfo -domain domain_name
		- Data from CA storage
        	certinfo -serial serial_number -aki authority_key_id (requires -db-config)

	Flags:
	  -aki="": certificate issuer (authority) key identifier
  -cert="": Client certificate that contains the public key
  -db-config="": certificate db configuration file
  -domain="": remote server domain name
  -serial="": certificate serial number