url: remember http password database in ui object

url: remember http password database in ui object

This makes http password database stored in ui object.
It allows reusing authentication information when we
use this database for creating password manager for
the new connection.

--- a/mercurial/ui.py	Sun Jun 05 23:36:23 2016 +0200
+++ b/mercurial/ui.py	Thu Jun 09 11:41:36 2016 +0200
@@ -29,6 +29,8 @@
     util,
 )
 
+urlreq = util.urlreq
+
 samplehgrcs = {
     'user':
 """# example user config (see "hg help config" for more info)
@@ -124,6 +126,8 @@
             self.callhooks = src.callhooks
             self.insecureconnections = src.insecureconnections
             self.fixconfig()
+
+            self.httppasswordmgrdb = src.httppasswordmgrdb
         else:
             self.fout = sys.stdout
             self.ferr = sys.stderr
@@ -135,6 +139,8 @@
             for f in scmutil.rcpath():
                 self.readconfig(f, trust=True)
 
+            self.httppasswordmgrdb = urlreq.httppasswordmgrwithdefaultrealm()
+
     def copy(self):
         return self.__class__(self)
 
@@ -142,6 +148,7 @@
         """Clear internal state that shouldn't persist across commands"""
         if self._progbar:
             self._progbar.resetstate()  # reset last-print time of progress bar
+        self.httppasswordmgrdb = urlreq.httppasswordmgrwithdefaultrealm()
 
     def formatter(self, topic, opts):
         return formatter.formatter(self, topic, opts)

--- a/mercurial/url.py	Sun Jun 05 23:36:23 2016 +0200
+++ b/mercurial/url.py	Thu Jun 09 11:41:36 2016 +0200
@@ -365,7 +365,7 @@
             urlreq.httpshandler.__init__(self)
             self.ui = ui
             self.pwmgr = passwordmgr(self.ui,
-                                     urlreq.httppasswordmgrwithdefaultrealm())
+                                     self.ui.httppasswordmgrdb)
 
         def _start_transaction(self, h, req):
             _generic_start_transaction(self, h, req)
@@ -482,7 +482,7 @@
         handlers = [
             httpconnectionmod.http2handler(
                 ui,
-                passwordmgr(ui, urlreq.httppasswordmgrwithdefaultrealm()))
+                passwordmgr(ui, ui.httppasswordmgrdb))
         ]
     else:
         handlers = [httphandler()]
@@ -491,7 +491,7 @@
 
     handlers.append(proxyhandler(ui))
 
-    passmgr = passwordmgr(ui, urlreq.httppasswordmgrwithdefaultrealm())
+    passmgr = passwordmgr(ui, ui.httppasswordmgrdb)
     if authinfo is not None:
         passmgr.add_password(*authinfo)
         user, passwd = authinfo[2:4]