Get project administrators for project
        :param key: project key
        :return: project administrators

def project_users_with_administrator_permissions(self, key):
        """
        Get project administrators for project
        :param key: project key
        :return: project administrators
        """
        project_administrators = [user['user'] for user in self.project_users(key)
                                  if user['permission'] == 'PROJECT_ADMIN']
        for group in self.project_groups_with_administrator_permissions(key):
            for user in self.group_members(group):
                project_administrators.append(user)
        return project_administrators