Merge branch 'refactoring-python-preprocessor'

test/box/snapshot.test

test/box_memcached/cas.result

test/box_memcached/cas.test

test/box_memcached/expirations.test

test/box_memcached/flags.result

test/box_memcached/flags.test

test/box_memcached/flush-all.test

test/box_memcached/getset.test

test/box_memcached/multiversioning.result

test/box_memcached/multiversioning.test

test/box_memcached/noreply.result

test/box_memcached/noreply.test

test/box_replication/consistent.test

test/box_replication/hot_standby.test

test/box_replication/swap.test

test/lib/admin_connection.py

test/lib/memcached_connection.py

test/lib/tarantool_box_server.py

test/lib/tarantool_connection.py

test/lib/tarantool_preprocessor.py