How to run all the enabled LTP tests

1. Compile VTS and LTP source code

$ make vts -j12

2. Start VTS10-TradeFed

$ vts10-tradefed

3. Run kernel LTP test from VTS-TradeFed console

> run vts-kernel

This will take from 30 minutes to 2 hours to run. The test results can be found under out/host/linux-x86/vts/android-vts/results/, while the device logcat and host logs can be found under out/host/linux-x86/vts/android-vts/logs/.