Add waiter of node availability by SSH in negative CIC MM test

Closes-Bug: #1621004

Change-Id: I4b0b3c508626d84e14fe4acb95d703213d2ab27a

fuelweb_test/tests/tests_strength/test_cic_maintenance_mode.py

@@ -13,6 +13,7 @@
 #    under the License.
 import time
 
+from devops.helpers.helpers import tcp_ping
 from devops.helpers.helpers import wait_pass
 from devops.helpers.helpers import wait
 from proboscis import asserts
@@ -438,6 +439,11 @@ class CICMaintenanceMode(TestBasic):
         logger.info('Check that node-{0} not in maintenance mode after'
                     ' unexpected reboot'.format(_id))
 
+        wait(lambda: tcp_ping(_ip, 22),
+             timeout=60 * 10,
+             timeout_msg='Node {} still is not available by SSH'.format(
+                 dregular_ctrl.name))
+
         asserts.assert_false('True' in check_auto_mode(_ip),
                              "Maintenance mode should not switched")