added a test to verify riak-repl script parameters

Calling `riak-repl cascades` or `riak-repl cascades always` etc on **Ubuntu** failed due to a shift error in the script. 
This test makes sure riak-repl talks to riak_repl_console correctly. See comments in replication2_console_tests.erl for more info.

Note: These PRs must be merged for these tests to pass:
* https://github.com/basho/riak_ee/pull/212
* https://github.com/basho/riak_repl/pull/506

see riak_ee issue #159.

once merged, I'll submit info to Giddyup.