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This change fixes developer helper tasks made for managing acceptance
VMs easier. We also remove methods that are superseded by beaker
functionality.

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Fix the releasing of hosts helper task by using the user's vmpooler
token from their .fog file. We also remove some lingering
preserved_config logic, which is no longer used due to improvements in
beaker.

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Many people run with beaker standalone. Common and required options have
been moved to the options files to support this workflow in this change.
We also move common options to their own file and load them into the
other options files that are loaded by beaker.

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This change moves host file generation to its own task. This separates
its concerns from the testing tasks, and allows the testing tasks to be
dependent upon it.

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