Modification of mounted volume check

Remote ssh execution returns object with bash outputs.
Elements in "stdout" of "ls" command contains '\n'
endings. So test assert was changed to fix false fail.

Change-Id: I241750d970a6634cb60c0ab905f0e4b7030834ec
Closes-Bug: 1618022
(cherry picked from commit 437155a3cb)

fuelweb_test/tests/test_ceph.py

@@ -564,7 +564,7 @@ class VmBackedWithCephMigrationBasic(TestBasic):
             13. Create a volume and attach it to the VM
             14. Create filesystem on the new volume and mount it to the VM
             15. Migrate VM
-            16. Mount the volume after migration
+            16. Check that volume was mounted
             17. Check cluster and server state after migration
             18. Terminate VM
 
@@ -645,8 +645,6 @@ class VmBackedWithCephMigrationBasic(TestBasic):
         logger.info("Srv is currently in status: {:s}".format(srv.status))
 
         # Prepare to DHCP leases checks
-        net_name = self.fuel_web.get_cluster_predefined_networks_name(
-            cluster_id)['private_net']
         srv_instance_ip = os.get_nova_instance_ip(srv, net_name=net_name)
         srv_host_name = self.fuel_web.find_devops_node_by_nailgun_fqdn(
             os.get_srv_hypervisor_name(srv),
@@ -795,21 +793,21 @@ class VmBackedWithCephMigrationBasic(TestBasic):
              timeout_msg='VM ssh port ping timeout after migration')
 
         self.show_step(16)
-        logger.info("Mount volume after migration")
+        logger.info("Check that volume was mounted")
         with self.fuel_web.get_ssh_for_node("slave-01") as remote:
             out = remote.execute_through_host(
                 floating_ip.ip,
-                'sudo mount /dev/vdb /mnt',
+                'mount | grep "/dev/vdb on /mnt"',
                 auth=creds)
-
-        logger.info("out of mounting volume is: {:s}".format(out['stdout']))
+        assert_true(out['stdout'] and out['exit_code'] == 0,
+                    "Volume was not mounted")
 
         with self.fuel_web.get_ssh_for_node("slave-01") as remote:
             out = remote.execute_through_host(
                 floating_ip.ip,
                 "sudo ls /mnt",
                 auth=creds)
-        assert_true("file-on-volume" in out['stdout'],
+        assert_true("file-on-volume\n" in out['stdout'],
                     "File is absent in /mnt")
 
         self.show_step(17)
@@ -892,7 +890,7 @@ class CheckCephPartitionsAfterReboot(TestBasic):
         self.show_step(6)
         for node in ["slave-02", "slave-03"]:
 
-            self.show_step(7, node)
+            self.show_step(7, node, True)
             logger.info("Get partitions for {node}".format(node=node))
             _ip = self.fuel_web.get_nailgun_node_by_name(node)['ip']
             before_reboot_partitions = [utils.get_ceph_partitions(