ash: copy function tests from hush testsuite

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-misc/func_args1.tests

@@ -0,0 +1,9 @@
+
+f() { echo "'f $1 $2 $3' called"; }
+
+set -- a b c
+echo "params: $1 $2 $3"
+f 1 2 3
+echo "params: $1 $2 $3"
+true | f 1 2 3
+echo "params: $1 $2 $3"