Remove unused "_ping_host_from_export_location" method

There is an other method for pinging to the export location,
called "validate_ping_to_export_location".

Change-Id: Ia23b11fec8ac3a36d4c424c50129523ad3b7e912
diff --git a/manila_tempest_tests/tests/scenario/test_share_basic_ops.py b/manila_tempest_tests/tests/scenario/test_share_basic_ops.py
index c2f019e..aebc231 100644
--- a/manila_tempest_tests/tests/scenario/test_share_basic_ops.py
+++ b/manila_tempest_tests/tests/scenario/test_share_basic_ops.py
@@ -45,13 +45,6 @@
      * Terminate the instance
     """
 
-    def _ping_host_from_export_location(self, export, remote_client):
-        ip, version = self.get_ip_and_version_from_export_location(export)
-        if version == 6:
-            remote_client.exec_command("ping6 -c 5 %s" % ip)
-        else:
-            remote_client.exec_command("ping -c 5 %s" % ip)
-
     @decorators.idempotent_id('825be71c-cf14-4884-a0ad-cf47d511df9a')
     @tc.attr(base.TAG_POSITIVE, base.TAG_BACKEND)
     def test_mount_share_one_vm(self):