bug#56227: 29.0.50; Eshell globs ending with '/' should match directories only

[Jim Porter <jporterbugs@gmail.com>]

In regular shells, the pattern '*' matches any (non-dot) file, whereas 
'*/' only matches directories:

   $ echo *
   admin args config.log config.status doc etc leim lib lib-src lisp
   lwlib Makefile nextstep nt oldXMenu src test
   $ echo */
   admin/ doc/ etc/ leim/ lib/ lib-src/ lisp/ lwlib/ nextstep/ nt/
   oldXMenu/ src/ test/

However, in Eshell, both of these do the same thing:

   ~ $ echo *
   ("Makefile" "admin/" "args" "config.log" "config.status" "doc/" "etc/"
   "leim/" "lib-src/" "lib/" "lisp/" "lwlib/" "nextstep/" "nt/"
   "oldXMenu/" "src/" "test/")
   ~ $ echo */
   ("Makefile" "admin/" "args" "config.log" "config.status" "doc/" "etc/"
   "leim/" "lib-src/" "lib/" "lisp/" "lwlib/" "nextstep/" "nt/"
   "oldXMenu/" "src/" "test/")

For consistency with other shells, and to make Eshell's globbing more 
expressive, I think we should make the latter match directories only. 
While this technically changes an existing behavior, it should be a safe 
change to make, since there's currently no reason I'm aware of to add a 
trailing slash to an Eshell glob.

Patch forthcoming; just getting a bug number...