hush testsuite: add many tests from ash testsuite

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

shell/hush_test/hush-misc/heredoc4.right

@@ -0,0 +1 @@
+'$'

shell/hush_test/hush-misc/heredoc4.tests

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+cat <<EOF
+'$'
+EOF

shell/hush_test/hush-misc/last_amp.right

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+3
+End

shell/hush_test/hush-misc/last_amp.tests

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+$THIS_SH -c 'echo 3&'
+d=`date`
+while test "`date`" = "$d"; do true; done
+d1=`date`
+$THIS_SH -c 'sleep 1&'
+d2=`date`
+test "$d1" = "$d2" || echo BAD
+echo End

shell/hush_test/hush-misc/local1.right

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+A1:'A'
+A2:''
+A3:''
+A4:'A'

shell/hush_test/hush-misc/local1.tests

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+a=A
+f() {
+	local a
+	# the above line unsets $a
+	echo "A2:'$a'"
+	unset a
+	echo "A3:'$a'"
+}
+echo "A1:'$a'"
+f
+echo "A4:'$a'"

shell/hush_test/hush-misc/nulltick1.right

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+Test 1
+Test 2
+Done

shell/hush_test/hush-misc/nulltick1.tests

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+echo Test ` ` 1
+echo Test `</dev/null` 2
+echo Done