A more secure root-wrapper alternative

Alternative to using a sudoers file to limit which commands can be run as
root in Nova. This one makes use of command filters defined in Nova code
itself, which can be customized to deeply inspect command arguments before
allowing a command to be executed.

This change puts the infrastructure in place, together with command filters
that replicate the level of filtering provided by a sudoers file (no deep
argument inspection yet). An example of an advanced filter (RegExpFilter) is
also provided. This new root wrapper is not active by default (root_helper
still defaults to "sudo"). Implements blueprint nova-rootwrap.

Change-Id: I7ad723b55e9446758876f21b4fbb09374a910425

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