helpers/bootrr: move timeout to separate helper

There is no need to have timeout as a function in the bootrr file. Move
it to a separate helper file as we have for the rest of helpers.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

helpers/bootrr

@@ -1,18 +1,5 @@
 #!/bin/sh
 
-timeout() {
-	attempts="$1"; shift
-	cmd="$@"
-
-	for i in `seq ${attempts}`
-	do
-		$cmd && return 0 
-		sleep 1
-	done
-
-	return 1
-}
-
 test_report_exit() {
 	TEST_RESULT=$1
 	command -v lava-test-case

helpers/timeout

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+if [ $# -lt 2 ]; then
+	echo "Usage: $0 <seconds> <command> <args>...."
+	exit 1
+fi
+
+attempts="$1"; shift
+cmd="$@"
+
+for i in `seq ${attempts}`
+do
+	$cmd && exit 0 
+	sleep 1
+done
+
+exit 1