add a pathological test case for here doc related to eof marker and other ugly corner cases

shell/hush_test/hush-misc/heredoc2.right

@@ -0,0 +1,7 @@
+exit EOF-f
+"
+echo 1
+moo	 
+ EOF-f
+EOF-f   f
+EOF-f 

shell/hush_test/hush-misc/heredoc2.tests

@@ -0,0 +1,10 @@
+f=1
+  cat <<- EOF-f
+		exit EOF-f
+"
+echo $f
+		moo	 
+ EOF-f
+EOF-f   f
+EOF-f 
+EOF-f