identify: show remote bookmarks in `hg id url -Tjson -B`

I didn't display bookmarks when `default and not ui.quiet`: it seems
strange for templates to depend on --id or -q, and it would take more
code for `hg id url -T {node}` to not request remote bookmarks.

An alternative I thought of was providing lazy data to the formatter,
`fm.data(bookmarks=lambda: fm.formatlist(getbms(), name='bookmark'))`.
The plainformatter would naturally not compute it, the
templateformatter would compute only what it needs, and the other ones
would compute everything, but that's not supported (or I don't see
how), so I abandoned this idea.

Differential Revision: https://phab.mercurial-scm.org/D4872

mercurial/commands.py

@@ -3111,7 +3111,7 b' def identify(ui, repo, source=None, rev='
                     output.append(bm)
         else:
             fm.data(node=hex(remoterev))
-            if 'bookmarks' in fm.datahint():
+            if bookmarks or 'bookmarks' in fm.datahint():
                 fm.data(bookmarks=fm.formatlist(getbms(), name='bookmark'))
     else:
         if rev: