Creating the installation manifests results in a bogus warning message about discarding existing manifests, even though none exist.

Tested on 4.15 dev, but the problem appears to have been present since 4.2.

100%

1. Start with an empty dir containing only an install-config.yaml with platform: baremetal
2. Run "openshift-install create manifests"
3. There is no step 3

INFO Consuming Install Config from target directory 
WARNING Discarding the Openshift Manifests that was provided in the target directory because its dependencies are dirty and it needs to be regenerated 
INFO Manifests created in: test/manifests and test/openshift 

INFO Consuming Install Config from target directory           
INFO Manifests created in: test/manifests and test/openshift 

The issue is due to multiple assets referencing the same files.