Add sleep into b2g startup, it makes the RIL work spiffingly

I don't know why but this makes the RIL work really well.

Maybe it just gives it a bit of time to sync up, get signal, make APN connection.

It doesn't seem to add much time to the test run either.

Let's run it on adhoc a couple of times first.

`master` -> Yes
`v1-train` -> Yes