Rewrite testBadApkOnly (1/n)

When tradefed fails to run a test, it will try to recover the device
which might lead to another reboot. This interferes with our test
flow which also involves reboot. See b/150749023#comment2 for more
details.

Let's rewrite the test to prevent auto-recovery of tradefed from kicking
in. Generally, it is a bad practice to depend our test flow on a failed
test due to reboot. We should call #waitForDeviceNotAvailable to wait
for reboot to happen and then call #waitForDeviceAvailable before
continuing next tests.

Bug: 150749023
Test: atest StagedRollbackTest#testBadApkOnly
Change-Id: Ia39630585c3b7344174a8c66d0a33f05a2d80cc7