Ignore END PRELUDE command

It doesn't seem to do anything and just spams that logs. Thanks to
Jean-Francois Panisset for the report.

ChangeLog

 |-----------------------------------------------------------------------|
 xxxx-xx-xx : Version -dev
  * Add parsing support for CONFIGURATION command
+ * Ignore 'END PRELUDE' command
 
 2014-12-08 : Version 2.0
  * Add support for --list-proc-units and --list-frames.

cmd.c

 	[CMD_PROTOCOL_PREAMBLE]    = "PROTOCOL PREAMBLE",
 	[CMD_VIDEOHUB_DEVICE]      = "VIDEOHUB DEVICE",
 	[CMD_CONFIGURATION]        = "CONFIGURATION",
+	[CMD_END_PRELUDE]          = "END PRELUDE",
 	[CMD_INPUT_LABELS]         = "INPUT LABELS",
 	[CMD_OUTPUT_LABELS]        = "OUTPUT LABELS",
 	[CMD_VIDEO_OUTPUT_LOCKS]   = "VIDEO OUTPUT LOCKS",
 		.port_id1 = "frame",
 		.opt_prefix = "fr",
 	},
+	[CMD_END_PRELUDE]          = { .cmd = CMD_END_PRELUDE         , .type = PARSE_NONE },
 	[CMD_PING]                 = { .cmd = CMD_PING                , .type = PARSE_NONE },
 	[CMD_ACK]                  = { .cmd = CMD_ACK                 , .type = PARSE_NONE },
 	[CMD_NAK]                  = { .cmd = CMD_NAK                 , .type = PARSE_NONE },

cmd.h

 
 #include <stdbool.h>
 
-#define NUM_COMMANDS 25
+#define NUM_COMMANDS 26
 
 enum vcmd {
 	CMD_PROTOCOL_PREAMBLE,
 	CMD_VIDEOHUB_DEVICE,
 	CMD_CONFIGURATION,
+	CMD_END_PRELUDE,
 	CMD_INPUT_LABELS,
 	CMD_OUTPUT_LABELS,
 	CMD_VIDEO_OUTPUT_LOCKS,

test/test-17.ok

          Please report this command to author's email: georgi@unixsol.org
          You may use -q or --quiet to suppress the message.
 ---------8<-----------8<----------- cut here ---------8<------------8<---------
-END PRELUDE:
----------8<-----------8<----------- cut here ---------8<------------8<---------
-WARNING: Videohub sent unknown command!
-         Please report this command to author's email: georgi@unixsol.org
-         You may use -q or --quiet to suppress the message.
----------8<-----------8<----------- cut here ---------8<------------8<---------
 ENGINEERING:
 0 Hack
 1 Hack
          Please report this command to author's email: georgi@unixsol.org
          You may use -q or --quiet to suppress the message.
 ---------8<-----------8<----------- cut here ---------8<------------8<---------
-END PRELUDE:
----------8<-----------8<----------- cut here ---------8<------------8<---------
-WARNING: Videohub sent unknown command!
-         Please report this command to author's email: georgi@unixsol.org
-         You may use -q or --quiet to suppress the message.
----------8<-----------8<----------- cut here ---------8<------------8<---------
 ENGINEERING:
 0 Debug
 ---------8<-----------8<----------- cut here ---------8<------------8<---------