Adds a usb handle property to fastboot commands to mirror adb commands
Makes the default timeout overridable from the common cli daemon
Adds a flag to control the chunk size that fastboot writes.

I'm scared to change the default since it's unclear how it was chosen
but for our devices we've seen large speed increases in flashing by increasing
this value to 1MB.  Some devices can go higher but at least one of our
devices had a 1MB limit.
Increase the default timeout for cli tools, 200ms is too fast
Adds a missing common_stub file