skip cpu_percent test for Linux

Signed-off-by: Alexey Rokhin <[email protected]>

tests/integration/service_test.py

@@ -30,6 +30,7 @@ from compose.const import LABEL_ONE_OFF
 from compose.const import LABEL_PROJECT
 from compose.const import LABEL_SERVICE
 from compose.const import LABEL_VERSION
+from compose.const import IS_WINDOWS_PLATFORM
 from compose.container import Container
 from compose.errors import OperationFailedError
 from compose.project import OneOffFilter