[automerger skipped] DO NOT MERGE Add sleep(3) after stopSupplicant when VtsHalWifiSupplicant am: ca07893589 -s ours am: 8adb4f6581 -s ours am: ad6c07e4c8 am: 1d251753e7 -s ours am: a635038c52

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

Change-Id: I7ec1258fa918cab72decdce33be00386cdb5f4e7