test: drop whitespace after shell redirection operators

(The one case that is left unchanged is '< <(subcommand)'.)

This way, the style with no gap was already dominant. This way, the reader
immediately knows that ' < ' is a comparison operator and ' << ' is a shift.

In a few cases, replace custom EOF replacement by just EOF. There is no point
in using someting like "_EOL" unless "EOF" appears in the text.

test/TEST-77-OPENFILE/test.sh

@@ -9,8 +9,8 @@ TEST_DESCRIPTION="Openfile tests"
 
 test_append_files() {
     local workspace="${1:?}"
-    echo "Open" > "$workspace/test-77-open.dat"
-    echo "File" > "$workspace/test-77-file.dat"
+    echo "Open" >"$workspace/test-77-open.dat"
+    echo "File" >"$workspace/test-77-file.dat"
 }
 
 do_test "$@"