Add simple script to mount android rootfs on non snap env

Disable module building and loading on non xenial systems

Add initial travis build configuration

We need to use docker here as travis only provides Ubuntu 14.04 based
images which are not enough for us to build everything.

emugl: use our internal logger instead of the emugl one

qemud: send message size in hexadecimal format

All sizes need to be printed in hexadecimal. Otherwise size of the
actual data doesn't match and messages are not processed inside the
container.

Fix build with warnings turned on.

Support positional arguments.

Please note that this feature requires a reecent boost version, ideally 1.57 or
later.

Add protection key to calc_vm_prot_bits() on kernels >= 4.5.0

Audio playback still has a delay about 1-2 seconds but it's usable.

This also moves the platform policy class into its own namespace to be
not specific to just window management.

We import all code here so we can customize and keep in sync with what
we do on the host side more easily.

On the Android side this requires no change with the current setup.