supplicant(vts): Remove start/stop framework

This is already done by the test harness on the host side. So, no need
to invoke this from within the gtest.

Bug: 63914399
Test: `make vts -j30 BUILD_GOOGLE_VTS=true TARGET_PRODUCT=aosp_arm64 &&
vts-tradefed run commandAndExit vts --skip-all-system-status-check
--primary-abi-only --skip-preconditions --module
VtsHalWifiSupplicantV1_0Target -l INFO`

Change-Id: I43edc03492bf5e03f9a4236265c43baa5efcd61d
(cherry picked from commit 145cce98)
Merged-Id: I43edc03492bf5e03f9a4236265c43baa5efcd61d