libicd-network-wpasupplicant: verify server certificates

[MerlijnWajer]

from the useful page: https://www.freebsd.org/cgi/man.cgi?wpa_supplicant.conf(5)

     ca_cert
	     Pathname to CA certificate	file.  This file can have one or more
	     trusted CA	certificates.  If ca_cert is not included, server cer-
	     tificates will not	be verified (not recommended).

[MerlijnWajer]

     ca_cert2
	     Like ca_cert but for EAP inner Phase 2.

     client_cert2
	     Like client_cert but for EAP inner	Phase 2.

     private_key2
	     Like private_key but for EAP inner	Phase 2.

     private_key2_passwd
	     Like private_key_passwd but for EAP inner Phase 2.````