test: update test-run

* added more details about hung tests (#107);
* added show_reproduce_content option (#113);
* fixed inspector error reporting for a failed app test;
* expand action of use_unix_socket option to non-default servers;
* updated tarantool-python submodule (#126);
* added test_run:wait_cond() and test_run:wail_log().

Updated box-py/call.test.py result file, because tarantool-python now
uses CALL 1.7 convention by default and slightly changed yaml output
formatting. See [1] and [3] for more information.

Updated replication-py/cluster.test.py, because of changed
tarantool-python internals, see commit [2].

Updated box-py/iproto.test.py because it uses tarantool-python internals
that was rewritten in [2]. Updated its result file according to CALL 1.7
response format that was set as default with [1] and yaml output
formatting changed within [3].

Updated replication-py/swap.test.py result file, because of yaml output
formatting that was slightly changed within [3].

[1]: https://github.com/tarantool/tarantool-python/issues/82
[2]: https://github.com/tarantool/tarantool-python/commit/4639d9ae1c48f1608bd599c6d93ed6bfca48fbf9
[3]: https://github.com/tarantool/tarantool-python/issues/90