shelve: omit incorrect 'commit' suggestion at 'hg shelve -i'

Before this patch, 'hg shelve -i' under non-interactive mode suggests
'use commit instead', and it obviously incorrect, because what user
wants to do isn't 'commit' but 'shelve'.

To omit incorrect 'commit' suggestion at 'hg shelve -i', this patch
specifies 'None' for 'cmdsuggest' argument of 'cmdutil.dorecord()'.

hgext/shelve.py

@@ -279,7 +279,7 b' def createcmd(ui, repo, pats, opts):'
         if not interactive:
             node = cmdutil.commit(ui, repo, commitfunc, pats, opts)
         else:
-            node = cmdutil.dorecord(ui, repo, interactivecommitfunc, 'commit',
+            node = cmdutil.dorecord(ui, repo, interactivecommitfunc, None,
                                     False, cmdutil.recordfilter, *pats, **opts)
         if not node:
             stat = repo.status(match=scmutil.match(repo[None], pats, opts))

tests/test-shelve.t

@@ -860,6 +860,9 b' Test interactive shelve'
   $ cat foo/foo
   foo
   a
+  $ hg shelve --interactive --config ui.interactive=false
+  abort: running non-interactively
+  [255]
   $ hg shelve --interactive << EOF
   > y
   > y