Fix checkstyle for ducktape

Author: timoninmaxim

modules/ducktests/tests/ignitetest/services/utils/ignite_spec.py

@@ -245,7 +245,8 @@ def envs(self):
         return {
             'EXCLUDE_TEST_CLASSES': 'true',
             'IGNITE_LOG_DIR': self.service.log_dir,
-            'USER_LIBS': ":".join(self.libs())
+            'USER_LIBS': ":".join(self.libs()),
+            "MAIN_CLASS": self.service.main_java_class
         }
 
     def config_file_path(self):
@@ -300,9 +301,6 @@ def _runcmd(self, cmd):
         if proc.returncode != 0:
             raise RuntimeError("Command '%s' returned non-zero exit status %d: %s" % (cmd, proc.returncode, stdout))
 
-    def envs(self):
-        return {"MAIN_CLASS": self.service.main_java_class}
-
 
 class IgniteNodeSpec(IgniteSpec):
     """

modules/ducktests/tests/ignitetest/tests/dns_failure_test.py

@@ -16,7 +16,6 @@
 """
 Module contains DNS service failure test.
 """
-import os
 import socket
 
 from ducktape.mark import defaults
@@ -27,7 +26,6 @@
 from ignitetest.services.utils.ignite_configuration import IgniteConfiguration, DataStorageConfiguration
 from ignitetest.services.utils.ignite_configuration.data_storage import DataRegionConfiguration
 from ignitetest.services.utils.ignite_configuration.discovery import from_ignite_cluster
-from ignitetest.services.utils.jvm_utils import java_major_version
 from ignitetest.utils import ignite_versions
 from ignitetest.utils.ignite_test import IgniteTest
 from ignitetest.utils.version import IgniteVersion, DEV_BRANCH