Use new style for chain initialization in geth
Use new style for chain initialization in geth

The formerly deprecated `--genesis` flag was now removed in favor
of explicitely calling `geth init` on a datadir. This change reflects
that change for the test cluster setup.

tomashaber/raiden,hackaugusto/raiden,tomaaron/raiden,tomaaron/raiden,tomaaron/raiden,charles-cooper/raiden,tomashaber/raiden,hackaugusto/raiden,charles-cooper/raiden,tomashaber/raiden,tomashaber/raiden,tomashaber/raiden,tomaaron/raiden