Fixed the creategpu command

[eriknil-onehot]

The datalab beta create-gpu command is broken. The reason for this is that:

1. Since /root is read only, configuring docker for use with gcr as root will fail.
2. The cos-gpu-installer container (https://github.com/GoogleCloudPlatform/cos-gpu-installer) requires a more recent version of the NVidia drivers.

Everything works fine after changing the following:

• Updating the nvidia drivers to be compatible with the cos-gpu-installer docker image. Using version 418.67 which is the same as her.
• Changing the home directory for the cos-gpu-installer.service to one that is writeable.
• No longer running docker-credential-gcr configure-docker before the wait-for-startup-script.service.

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