telnet/auto-complete: hide deprecated and internal commands

For both:
- TCL proc that redirect deprecated commands to the new commands,
- TCL proc used internally and not supposed to be exposed to user,
add their name to the list of commands that should be hide by the
telnet auto-complete.

Change-Id: I05237c6a79334b7d2b151dfb129fb57b2f40bba6
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6195
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>

src/flash/startup.tcl

@@ -6,6 +6,7 @@
 # optional args: verify, reset, exit and address
 #
 
+lappend _telnet_autocomplete_skip program_error
 proc program_error {description exit} {
 	if {$exit == 1} {
 		echo $description