tests: monkeypatch `util.get_password()` to avoid deadlocks on Windows

This should have been part of 5b3513177f2b.

Differential Revision: https://phab.mercurial-scm.org/D10759

tests/test-http-bundle1.t

@@ -192,10 +192,10 b' test http authentication'
   $ cat pid >> $DAEMON_PIDS
 
   $ cat << EOF > get_pass.py
-  > import getpass
-  > def newgetpass(arg):
+  > from mercurial import util
+  > def newgetpass():
   >   return "pass"
-  > getpass.getpass = newgetpass
+  > util.get_password = newgetpass
   > EOF
 
   $ hg id http://localhost:$HGPORT2/

tests/test-http.t

@@ -181,10 +181,10 b' test http authentication'
   $ cat pid >> $DAEMON_PIDS
 
   $ cat << EOF > get_pass.py
-  > import getpass
-  > def newgetpass(arg):
+  > from mercurial import util
+  > def newgetpass():
   >   return "pass"
-  > getpass.getpass = newgetpass
+  > util.get_password = newgetpass
   > EOF
 
   $ hg id http://localhost:$HGPORT2/

tests/test-largefiles-wireproto.t

@@ -425,10 +425,10 b' a large file from the server rather than'
   >          -d -p $HGPORT --pid-file hg.pid -A access.log
   $ cat hg.pid >> $DAEMON_PIDS
   $ cat << EOF > get_pass.py
-  > import getpass
-  > def newgetpass(arg):
+  > from mercurial import util
+  > def newgetpass():
   >   return "pass"
-  > getpass.getpass = newgetpass
+  > util.get_password = newgetpass
   > EOF
   $ hg clone --config ui.interactive=true --config extensions.getpass=get_pass.py \
   >          http://user@localhost:$HGPORT credentialclone