Remove workaround for `openstack complete`

This reverts commit 6930ba312f787e0459f7455ac6ba2a70b3c7c37d.

By reverting this patch we are no longer using the bandaid fix mentioned
in the code. The latest openstackclient release (3.3.0) fixes the bug.

Related-Bug: 1619274

Change-Id: I20e3c5a92b97bf46c8d2318cd37044f0f36e1745
diff --git a/stack.sh b/stack.sh
index 1cc4eca..09466a6 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1383,12 +1383,7 @@
 # ===============
 
 # Prepare bash completion for OSC
-#
-# BUG: https://bugs.launchpad.net/python-openstackclient/+bug/1619274
-# the os-cloud param should not be required but if we don't provide it
-# then this command hangs indefinitely if something is wrong with
-# default environment credentials.
-openstack --os-cloud=devstack complete | sudo tee /etc/bash_completion.d/osc.bash_completion > /dev/null
+openstack complete | sudo tee /etc/bash_completion.d/osc.bash_completion > /dev/null
 
 # If cinder is configured, set global_filter for PV devices
 if is_service_enabled cinder; then