wpa: Import wpa_supplicant/hostapd commits up to b4f7506ff

Merge vendor commits 40c7ff83e74eabba5a7e2caefeea12372b2d3f9a,
efec8223892b3e677acb46eae84ec3534989971f, and
2f6c3ea9600b494d24cac5a38c1cea0ac192245e.

Tested by: philip
MFC after: 2 months

MFV r346563:

Update wpa_supplicant/hostapd 2.7 --> 2.8

Upstream documents the following advisories:

- https://w1.fi/security/2019-1/sae-side-channel-attacks.txt
- https://w1.fi/security/2019-2/eap-pwd-side-channel-attack.txt
- https://w1.fi/security/2019-3/sae-confirm-missing-state-validation.txt
- https://w1.fi/security/2019-4/eap-pwd-missing-commit-validation.txt
- https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-\
with-unexpected-fragment.txt

Relnotes: yes
MFC after: 1 week (or less)
Security: CVE-2019-9494, VU#871675, CVE-2019-9495, CVE-2019-9496,
CVE-2019-9497, CVE-2019-9498, CVE-2019-9499

MFV r341618:

Update wpa 2.6 --> 2.7.

MFV r324714:

Update wpa 2.5 --> 2.6.

MFC after: 1 month

Update hostapd/wpa_supplicant to version 2.5.

Tested by several people on current@/wireless@.

Relnotes: yes

Merge wpa_supplicant/hostapd 2.4.

Major changes are: SAE, Suite B, RFC 7268, EAP-PKE, ACS, and tons of
bug fixes.

Relnotes: yes