ui_tests: add function to run cmd on UI host

Run shell command on the UI system using "admin"
user's passwd from conf.

https://pagure.io/freeipa/issue/7441

Reviewed-By: Petr Vobornik <pvoborni@redhat.com>

ipatests/test_webui/ui_driver.py

@@ -30,6 +30,7 @@ import re
 import os
 from functools import wraps
 import unittest
+import paramiko
 
 # pylint: disable=import-error
 from six.moves.urllib.error import URLError
@@ -1643,6 +1644,33 @@ class UI_driver(object):
         self.find(ssh_pub, By.CSS_SELECTOR).click()
         self.facet_button_click('save')
 
+    def run_cmd_on_ui_host(self, cmd):
+        """
+        Run "shell" command on the UI system using "admin" user's passwd from
+        conf.
+        Use only where API does not fit.
+
+        cmd (str): command to run
+        """
+
+        login = self.config.get('ipa_admin')
+        hostname = self.config.get('ipa_server')
+        password = self.config.get('ipa_password')
+
+        try:
+            ssh = paramiko.SSHClient()
+            ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+            ssh.connect(hostname=hostname, username=login, password=password)
+            ssh.exec_command(cmd)
+        except paramiko.AuthenticationException:
+            self.skip('Authentication to server {} failed'.format(hostname))
+        except paramiko.SSHException as e:
+            self.skip('Unable to establish SSH connection: {}'.format(e))
+        except Exception as e:
+            self.skip('Unable to proceed: {}'.format(e))
+        finally:
+            ssh.close()
+
     def has_class(self, el, cls):
         """
         Check if el has CSS class