Revert "Wait for ping succeed before trying SSH in create|get_timestamp methods"

This reverts commit b5cd7d94276bf6b6785b04c7bbccbe231bb68d2d.

Reason for revert: PRODX-20935

Change-Id: I2a87614abcd3c9a9433afcaba6ffcaf75d15aa71
(cherry picked from commit 544ac83a1de6e09ba11ff79a9cf3f1fb32452bac)
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 1d06f3b..efdfe8e 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -751,9 +751,6 @@
         ssh_client = self.get_remote_client(ip_address,
                                             private_key=private_key,
                                             server=server)
-
-        self.check_vm_connectivity(ip_address, should_connect=True)
-
         if dev_name is not None:
             ssh_client.make_fs(dev_name)
             ssh_client.exec_command('sudo mount /dev/%s %s' % (dev_name,
@@ -771,9 +768,6 @@
         ssh_client = self.get_remote_client(ip_address,
                                             private_key=private_key,
                                             server=server)
-
-        self.check_vm_connectivity(ip_address, should_connect=True)
-
         if dev_name is not None:
             ssh_client.mount(dev_name, mount_path)
         timestamp = ssh_client.exec_command('sudo cat %s/timestamp'