Switch from starttls to SSL sockets

SSL sockets simplifies both libweave and device side.
Also removed Flush and Close method, as not needed with current design.

BUG=b:23529805

Change-Id: I6e2a5522f8a55d20b0ed6363a9955d37505d2c06
8 files changed
tree: 1b14a907d4b846d4e23e800ba3d8d0cc68ae5ba8
  1. libweave/