Updated openstack/openstack
Project: openstack/heat  c7b6a7d5a85801f7324764816c3c53344e84fb10
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StackUser add _delete_keypair function

Add function which allows a subclass to delete a keypair, required
for migration of User/AccessKey resources

Change-Id: I5f8923fa604a26c47d7a4226e8932dbd367bfbd1
blueprint: instance-users