tests: MBSSID and EMA

tests: MBSSID and EMA

Add test cases for MBSSID functionality with EMA.

Add helper functions to create the configuration file, start hostapd
instance and client association with the transmitting interface.

he_ap_mbssid_open: 4 VAPs with open security in multiple BSSID
configuration. The first interface transmits beacons and probe responses
which include the multiple BSSID element(s) with remaining profiles.

he_ap_mbssid_same_security: 2 VAPs, all with SAE. In such a case the
Multiple BSSID elements in management frames do not include RSN and RSNE
elements as all non-transmitting profiles have exact same security
configuration as the transmitting interface.

he_ap_mbssid_mixed_security{1,2}: 8 VAPs with mixed security
configurations (SAE, OWE, WPA2-PSK, open). he_ap_mbssid_mixed_security1:
Transmitting interface uses SAE. In this case the non-transmitting
profiles will include non inheritance element (IEEE Std 802.11-2020,
9.4.2.240) wherever the security differs from the transmitting profile.
he_ap_mbssid_mixed_security2: Transmitting profile is open hence no need
for the non inheritance elements. Instead each non-transmitting profile
includes RSN, RSNE if applicable.

he_ap_ema: Enhanced multi-BSS advertisements (EMA) with 8 VAPs all with
SAE configuration.

Signed-off-by: Aloka Dixit <quic_alokad@quicinc.com>