Don't allow rotating keys if stack not found
Don't allow rotating keys if stack not found

In Ic2769b69bf4b34669886dde1ef663d561d9e6173 we
changed to use stack env for key rotattion. There
is a regression, as we proceed when stack is not found
resulting in an AttributeError.

Change-Id: Ibb9323ee2777dbef84c5cdbc124d4abd34b34dba

openstack/tripleo-common,openstack/tripleo-common