modules/nilrt_ip.py: Fix _get_adaptor_mode
modules/nilrt_ip.py: Fix _get_adaptor_mode

The value returned by _load_config may have upper letters.

Signed-off-by: Alexandru Vasiu <12db13f1807ddd2f5e9e972458aecda3170fb20d@ni.com>

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt