I have modified following two functions in pgadmin_page.py :-
1. click_tab() -> Added wait till element is clickable, test cases are failing since the function attempts to click the tab which is not yet in the state to be clicked.
2. add_server() -> Replaced the sleep statement with wait till element to be clickable.
Please find the attached patch.
We should start using CSS selectors instead of xpath, otherwise the patch works fine and also changes look good to me.