[autoscaler] Increased head and worker storage to 25 GiB

[pschafhalter]

What do these changes do?

• Increased head and worker storage to 25 GiB for development YAML configuration file.

[AmplabJenkins]

Merged build finished. Test PASSed.

[AmplabJenkins]

Test PASSed.
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Test PASSed.

[ericl]

Thanks for looking into this! Would it also make sense to update the example.yaml file as well?

[robertnishihara]

Yes, I think that's a good idea. Even though the example uses a 50GB AMI already, people will probably modify it and having a template in place for changing the disk size would be useful.

[ericl]

Added a example conf to the main example.yaml

[AmplabJenkins]

Merged build finished. Test FAILed.

[AmplabJenkins]

Test FAILed.
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Test FAILed.

[richardliaw]

All builds except one mac build pass, and the test failure is unrelated (test/runtest.py)