Bump cfssl to be compatible with Go 1.10

vendor/github.com/cloudflare/cfssl/errors/error.go

@@ -149,6 +149,8 @@ const (
 
 	// UnknownProfile indicates that the profile does not exist.
 	UnknownProfile // 54XX
+
+	UnmatchedWhitelist // 55xx
 )
 
 // The following are API client related errors, and should be
@@ -189,6 +191,9 @@ const (
 	// PrecertSubmissionFailed occurs when submitting a precertificate to
 	// a log server fails
 	PrecertSubmissionFailed = 100 * (iota + 1)
+	// CTClientConstructionFailed occurs when the construction of a new
+	// github.com/google/certificate-transparency client fails.
+	CTClientConstructionFailed
 )
 
 // Certificate persistence related errors specified with CertStoreError
@@ -313,6 +318,8 @@ func New(category Category, reason Reason) *Error {
 			msg = "Policy violation request"
 		case UnknownProfile:
 			msg = "Unknown policy profile"
+		case UnmatchedWhitelist:
+			msg = "Request does not match policy whitelist"
 		default:
 			panic(fmt.Sprintf("Unsupported CFSSL error reason %d under category PolicyError.",
 				reason))