python tests splitted in box-py and xlog-py

test/box-py/args.result

test/box-py/args.test.py

test/box-py/bad_trigger.result

test/box-py/bad_trigger.test.py

test/box-py/bootstrap.result

test/box-py/bootstrap.test.py

test/box-py/box.lua

test/box-py/call.result

test/box-py/call.test.py

test/box-py/iproto.result

test/box-py/iproto.test.py

test/box-py/print.result

test/box-py/print.test.py

test/box-py/replica.lua

test/box-py/snapshot.result

test/box-py/snapshot.test.py

test/box-py/space_crash.result

test/box-py/space_crash.test.py

test/box-py/suite.ini

test/long_run-py/box.lua