shell: sync redir/* tests

Note: hush-redir/redir_to_bad_fd.tests currently fails

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-redir/redir5.right

@@ -0,0 +1,4 @@
+Backgrounded pipes shall have their stdin redirected to /dev/null
+Zero:0
+Zero:0
+Done

shell/ash_test/ash-redir/redir5.tests

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+echo "Backgrounded pipes shall have their stdin redirected to /dev/null"
+
+# 1. bash does not redirect stdin to /dev/null if it is interactive.
+# hush does it always (this is allowed by standards).
+
+# 2. Failure will result in this script hanging
+
+cat & wait; echo Zero:$?
+
+# This does not work for bash! bash bug?
+cat | cat & wait; echo Zero:$?
+
+echo Done

shell/hush_test/hush-redir/redir_to_bad_fd.right

@@ -0,0 +1,2 @@
+./redir_to_bad_fd.tests: line 2: 10: Bad file descriptor
+OK

shell/hush_test/hush-redir/redir_to_bad_fd.tests

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+# ash uses fd 10 (usually) for reading the script
+echo LOST >&10
+echo OK