Test if a specific extension is installed

    CLI Example:

    .. code-block:: bash

        salt '*' postgres.is_installed_extension

def is_installed_extension(name,
                           user=None,
                           host=None,
                           port=None,
                           maintenance_db=None,
                           password=None,
                           runas=None):
    '''
    Test if a specific extension is installed

    CLI Example:

    .. code-block:: bash

        salt '*' postgres.is_installed_extension

    '''
    installed_ext = get_installed_extension(
        name,
        user=user,
        host=host,
        port=port,
        maintenance_db=maintenance_db,
        password=password,
        runas=runas)
    return bool(installed_ext)