pkg/asset/cluster: Drop duplicate path from "Failed to read tfstate"

[wking]

Before this commit, the errors looked like:

ERROR Failed to read tfstate ("/tmp/openshift-install-122374392/terraform.tfstate"): open /tmp/openshift-install-122374392/terraform.tfstate: no such file or directory

now they will look like:

ERROR Failed to read tfstate: open /tmp/openshift-install-122374392/terraform.tfstate: no such file or directory

[yifan-gu]

/lgtm

[openshift-ci-robot]

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[wking]

e2e:

Oct  5 19:42:10.416: Couldn't delete ns: "e2e-tests-secrets-qj6mr": timed out waiting for the condition (&errors.errorString{s:"timed out waiting for the condition"})

Same as here. Should be fixed with #425 landed.

/retest

[wking]

Looks like the registry flaked out. e2e:

Unable to connect to the server: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

images:

Unable to connect to the server: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
2018/10/05 21:08:56 Container release in pod release-latest failed, exit code 1, reason Error
2018/10/05 21:09:12 Container artifacts in pod release-latest completed successfully
2018/10/05 21:09:13 Ran for 3m57s
error: could not run steps: failed to wait for release pod to complete: could not wait for pod completion: the pod ci-op-42y2j5lh/release-latest failed after 2m17s (failed containers: release):  unknown

/retest