add a second implementation of the unschroot example

While the first implementation created new namespaces for every
invocation in a similar way to sbuild's unshare mode, the second
implementation keeps a backround process with persistent user and mount
namespace around. This allows using a new tmpfs as backing device and
using fuse mounts for underlying filesystems.

Communication between the background process and the cli is implemented
using the https://github.com/helmutg/asyncvarlink varlink
implementation.

Chroots can be detected from typical locations or configured via
~/.config/unschroot.ini.

Thanks go out for fruitful discussions, feedback and testing to:
 * Christian Hofstaedler
 * Christoph Berg
 * Enrico Zini
 * Jochen Sprickerhof
 * Johannes Schauer Marin Rodrigues
 * Thomas Walz

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