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

We start by fixing this in the already-present OSC_Config class so OSC
can move forward.  This change needs to get ported down into
os-client-config in the near future, maybe even soon enough to make the
client library freeze this week.

* Add the pw-func argument to the OSC_Config (or OpenStackConfig) __init__()
* When looping through the auth options from the KSA plugin look for any
  that have a prompt defined and do not have a value already, so ask for one.

Closes-bug: #1617384
Change-Id: Ic86d56b8a6844516292fb74513712b486fec4442

In some part in the code we import objects.
In the Openstack style guidelines they recommend to import only modules.

http://docs.openstack.org/developer/hacking/#imports

Change-Id: I2eb35dc53f0fdb61c31022bb70293d1df8aaf482

The split to osc-lib shell lost the detection of --os-token and
--os-url to set --os-auth-type token_endpoint

Closes-bug: 1615988
Change-Id: I248f776a3a7b276195c162818f41ba20760ee545

Need to add the fixed_arguments arg to _validate_auth() so
os-client-config 1.19.1 and 1.20.0 can call our version properly.

Change-Id: I328e47ba2f8115e6b18bf1482fd4aa35056907a4