Two new SSH keys for myself

* modules/openstack_project/manifests/users.pp: Per guidelines in
sysadmin.rst, the time has come to rotate my SSH key so I'm adding a
new one and will remove the old one once I confirm it's updated
everywhere. At the same time I'm adding a temporary key which I will
use if needed while travelling for the Havana summit, and will
revoke as soon as it concludes.

Change-Id: I2d0083e2f420b05d8a8a28544096d197deeb13cc
Merge "Two new SSH keys for myself"