ktp: Add KTP_PARAM_PREFIX param type

klish/ktp.h

@@ -33,6 +33,7 @@ typedef enum {
 typedef enum {
 	KTP_PARAM_NULL = '\0',
 	KTP_PARAM_LINE = 'L',
+	KTP_PARAM_PREFIX = 'P', // Same as line but differ by meaning
 	KTP_PARAM_ERROR = 'E',
 	KTP_PARAM_RETCODE = 'R',
 } ktp_param_e;