[master] Use tput rather than hard-coded escape sequences

Rather than using terminal-specific hard-coded escape sequences that are
not guaranteed to work on all terminals, use the tput utility. Also use
the terminal defined standout mode rather than trying to set a specific
colour. The old way enabled bright yellow text which, while very visible
if your background is black, is all but invisible if your terminal
background is white.

Makefile.am

@@ -21,11 +21,11 @@ dist_doc_DATA = AUTHORS COPYING ChangeLog README
 .PHONY: check-valgrind check-valgrind-suppress
 
 install-exec-hook:
-	-@echo -e "\033[1;33m" # switch to yellow color text
+	-@tput smso  # Start standout mode
 	@echo "NOTE: BIND 10 does not automatically start DNS services when it is run"
 	@echo "      in its default configuration. Please see the Guide for information"
 	@echo "      on how to configure these services to be started automatically."
-	-@echo -e "\033[m" # switch back to normal
+	-@tput rmso  # End standout mode
 
 check-valgrind:
 if HAVE_VALGRIND