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

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

Change-Id: I2fb8e04f81e2172b24017ec3b6cf9f3dbbaf5adc