Add the + icon to "Add another network" in Wi-Fi screen in setup
wizard, and make the text black and sentence case.
Bug: 21089864
Change-Id: Iccfc5fc4ff5e50a599f3004a20e5cfa24a13043a
Changed the layout based on the new design mocks. Copied over
StickyHeaderListView and SetupWizardHeader. Currently using the
generic illustration but will update to Wifi setup specific version
once we get them.
Change-Id: I22bdef8c9860d419be55938e1e4a6a682db5b7e8