Returns the encryption mode of the given scan result.
Examples of capabilities:
[WPA2-PSK-CCMP][ESS]
[WPA2-PSK-CCMP+TKIP][ESS]
[WPA-PSK-CCMP+TKIP][WPA2-PSK-CCMP+TKIP][ESS] see more, here, here
[WPA-PSK-CCMP+TKIP][WPA2-PSK-CCMP+TKIP][ESS]
the encryption mode.
the scan result.