The ap_open_tdls_vht* test cases could leave some pending regulatory
Beacon hints waiting to be cleared during the following test case. This
would result in a failure if the following test case expected specific
regdom event behavior. For example, this caused "ap_open_tdls_vht160
dbus_country" sequence to result in failure in dbus_country. Fix this by
using more robust sequence in clearing regdom state at the end of the
TDLS test cases that have the AP advertising a country code.
Signed-off-by: Jouni Malinen <j@w1.fi>