test: Add "chamuyero", a tool to test line-oriented I/O

This patch adds "chamuyero", a a tool to test and validate line-oriented
commands and servers.

It can launch and communicate with other processes, and follow a script of
line-oriented request-response, validating the dialog as it goes along.

This can be used to test line-oriented network protocols (such as SMTP) or
interactive command-line tools.

It will be used in follow up patches to test new commands and
functionality.

test/util/lib.sh

@@ -5,11 +5,11 @@ function init() {
 		set -v
 	fi
 
+	export UTILDIR="$( realpath `dirname "${BASH_SOURCE[0]}"` )"
+
 	export TBASE="$(realpath `dirname ${0}`)"
 	cd ${TBASE}
 
-	export UTILDIR="$(realpath ${TBASE}/../util/)"
-
 	if [ "${RACE}" == "1" ]; then
 		RACE="-race"
 	fi
@@ -69,6 +69,10 @@ function mail_diff() {
 	${UTILDIR}/mail_diff "$@"
 }
 
+function chamuyero() {
+	${UTILDIR}/chamuyero "$@"
+}
+
 function success() {
 	echo success
 }