cmdutil: copy auth section in remoteui stable

cmdutil: copy auth section in remoteui

This allows me to specify an auth section in a .hg/hgrc instead of just
a global or user-level hgrc.

--- a/mercurial/cmdutil.py	Tue Dec 08 23:23:59 2009 +0100
+++ b/mercurial/cmdutil.py	Thu Dec 10 12:31:21 2009 +0100
@@ -111,11 +111,16 @@
         v = opts.get(o) or src.config('ui', o)
         if v:
             dst.setconfig("ui", o, v)
+
     # copy bundle-specific options
     r = src.config('bundle', 'mainreporoot')
     if r:
         dst.setconfig('bundle', 'mainreporoot', r)
 
+    # copy auth section settings
+    for key, val in src.configitems('auth'):
+        dst.setconfig('auth', key, val)
+
     return dst
 
 def revpair(repo, revs):