The IEEE 802.1x/EAPOL protocol version to use; either 1 (default)
or 2. The wpa_supplicant(8) utility is implemented according to
IEEE 802-1X-REV-d8 which defines EAPOL version to be 2. However,
some access points do not work when presented with this version
so by default wpa_supplicant(8) will announce that it is using
EAPOL version 1. If version 2 must be announced for correct
operation with an access point, this value may be set to 2.