[automerger skipped] DO NOT MERGE Add sleep(3) after stopSupplicant when VtsHalWifiSupplicant am: ca078935 -s ours

am skip reason: subject contains skip directive

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1478060

Change-Id: I86b5e98bdafa2539e649e522720ac020be01acd0