Fix repo packages not being installed

[hakman]

I think the refactoring of package.go in 6b011c0 introduced a bug that keeps repo packages from being installed.

From https://storage.googleapis.com/kubernetes-jenkins/logs/e2e-kops-aws-k8s-latest/1266103273169883138/artifacts/54.249.221.142/kops-configuration.log

I0528 20:27:01.652991     836 package.go:299] Installing package "chrony" (dependencies: [])
I0528 20:27:01.653018     836 package.go:355] running command [apt-get install --yes --no-install-recommends]

I0528 20:48:51.349091    6615 executor.go:103] Tasks: 64 done / 65 total; 1 can run
I0528 20:48:51.349125    6615 executor.go:174] Executing task "Service/chrony": Service: chrony
I0528 20:48:51.349177    6615 changes.go:81] Field changed "Running" actual="false" expected="true"
I0528 20:48:51.349187    6615 changes.go:81] Field changed "Enabled" actual="<nil>" expected="true"
I0528 20:48:51.349196    6615 changes.go:81] Field changed "ManageState" actual="<nil>" expected="true"
I0528 20:48:51.349205    6615 changes.go:81] Field changed "SmartRestart" actual="<nil>" expected="true"
I0528 20:48:51.349268    6615 service.go:329] Restarting service "chrony"
W0528 20:48:51.353398    6615 executor.go:128] error running task "Service/chrony" (9m58s remaining to succeed): error doing systemd restart chrony: exit status 5
Output: Failed to restart chrony.service: Unit chrony.service not found.
I0528 20:48:51.353418    6615 executor.go:143] No progress made, sleeping before retrying 1 failed task(s)

[hakman]

/cc @rifelpet @johngmyers

[johngmyers]

/lgtm

[johngmyers]

Sorry about that, Chief.

[hakman]

No worries, happens.

[rifelpet]

/approve

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