docs: recommend tt in remote test instructions

References to tarantoolctl have been replaced with tt.

Closed #313

Author: Mirochill

README.rst

@@ -132,11 +132,11 @@ On Linux:
 
 On Windows:
 
-* Setup a Linux machine with Tarantool installed.
+* Setup a Linux machine with Tarantool and ``tt`` installed.
   This machine will be referred to as ``remote`` in this instruction.
 * (On ``remote``) Copy ``test/suites/lib/tarantool_python_ci.lua`` to
   ``/etc/tarantool/instances.available``.
-* (On ``remote``) Run ``tarantoolctl start tarantool_python_ci``.
+* (On ``remote``) Run ``tt start tarantool_python_ci``.
 * Set the following environment variables:
   * ``REMOTE_TARANTOOL_HOST=...``,
   * ``REMOTE_TARANTOOL_CONSOLE_PORT=3302``.

test/suites/crud_server.lua

@@ -84,7 +84,6 @@ if crud_imported == false or vshard_imported == false then
     local fail_msg = 'The crud/vshard modules are not detected, ' ..
                      'installation via rocks install is required ' ..
                      'for CRUD testing purposes. You can use ' ..
-                     '<tarantoolctl rocks install crud> or ' ..
                      '<tt rocks install crud> to install modules'
     -- The print output will be captured in the logs.
     print(fail_msg)

test/suites/test_crud.py

@@ -65,7 +65,6 @@ def setUp(self):
             raise unittest.SkipTest('The crud/vshard modules are not detected, '
                                     'installation via rocks install is required '
                                     'for CRUD testing purposes. You can use '
-                                    '<tarantoolctl rocks install crud> or '
                                     '<tt rocks install crud> to install modules')
 
     crud_test_cases = {