Move linux command and wait method to common tools

Signed-off-by: Katarzyna Treder <katarzyna.treder@h-partners.com>

test_tools/fio/fio_param.py

@@ -13,7 +13,7 @@ from connection.base_executor import BaseExecutor
 from core.test_run import TestRun
 from storage_devices.device import Device
 from test_tools.fio.fio_result import FioResult
-from test_utils.linux_command import LinuxCommand
+from test_tools.common.linux_command import LinuxCommand
 from types.size import Size