Provide fallback prompt function for current osc-lib

Leaving the pw_func uninitialize in osc-lib turned out to be a
bad idea as the test to prompt in setup_auth() doesn't check
for a callback of None.

Also, release note

Change-Id: I8f875fa8a942d02a040238359ee22c603a4e5956

Author: Dean Troyer

openstackclient/common/clientmanager.py

@@ -20,6 +20,7 @@
 import sys
 
 from osc_lib import clientmanager
+from osc_lib import shell
 
 
 LOG = logging.getLogger(__name__)
@@ -48,6 +49,8 @@ def __init__(
         super(ClientManager, self).__init__(
             cli_options=cli_options,
             api_version=api_version,
+            # TODO(dtroyer): Remove this when osc-lib 1.2 is released
+            pw_func=shell.prompt_for_password,
         )
 
         # TODO(dtroyer): For compatibility; mark this for removal when plugin

releasenotes/notes/bug-1617384-55c88207115e2a5b.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix prompting for password issue introduced in release 3.0.0
+    [Bug `1617384 <https://bugs.launchpad.net/bugs/1617384>`_]