Update docker.service

Docker startup fails
You specified --iptables=false with --ipmasq=true. IP masquerading uses iptables to function. 
Please set --ipmasq to false or --iptables to true
Make Fluentd to GCP Logging image self-contained; add log rotation support
Fix paths for kubectl
Clean up e2e test
Merge pull request #2043 from hmrm/e2e-vagrant

Clean up e2e bash-in-go script
Merge pull request #2255 from rabi/master

Update docker.service
Merge pull request #2217 from satnam6502/fluentd-gcp-image

Make Fluentd to GCP Logging image self-contained
Make slashes always appended to buckets to avoid forgetting them.
Actually let hack/e2e.go run kubectl
Add 'source' to events field selector.
kubectl resource printing: actually do versioned print
Merge pull request #2308 from mbforbes/master

Always append slashes to bucket prefixes to avoid forgetting them.
refactor resource printer's version handling (to make adding --watch feature easier)
Merge pull request #2296 from brendandburns/fix

Fix paths for kubectl
Merge pull request #2309 from lavalamp/fix3

Refactors of kubectl object printers.