Move some of the SIM network code out of WifiStateMachine

Also add unit tests

TEST: Unit tests, boots and connects to open network
Bug: 29776729
Change-Id: I79161f87cee55abce464fb1bdbc643a92c069ffb
9 files changed
tree: 36c2f7c5d1bbc899f176b31406f6071779e5e76e
  1. libwifi_hal/
  2. libwifi_system/
  3. service/
  4. tests/