testing: fix bash specific syntax in dcop test

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 30d5bd4d72)

dcop/tests/run-tests.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 
 clean_up() {
 	rm -f batch.stdout shell.stdout shell.returns batch.returns
@@ -42,7 +43,7 @@ echo '* Running driver mode'
 ./driver "TestApp-$DCOP_TEST_PID" >driver.stdout || die "Failed to start driver"
 
 echo '* Running shell mode'
-source ./shell.generated >shell.returns
+. ./shell.generated >shell.returns
 
 echo -n '* Comparing ... '