patch 9.0.1647: insufficient testing for syntax plugins

Problem:    Insufficient testing for syntax plugins.
Solution:   Add shell file examples. (Charles Campbell)  Create a messages
            file for easier debugging and reporting the test results.
diff --git a/runtime/syntax/testdir/input/sh_01.sh b/runtime/syntax/testdir/input/sh_01.sh
new file mode 100644
index 0000000..2d4f6e8
--- /dev/null
+++ b/runtime/syntax/testdir/input/sh_01.sh
@@ -0,0 +1,4 @@
+#! /bin/sh
+export `echo 'A=B'`
+printenv A
+echo a `#foo` b