Deleting wifi certificates isn't supported yet since cascading the removal back into wifi configs will need some easy way of enumerating wifi configs first. Bug: 29208062 Change-Id: I2d9d1ea7e0974701009bfa6ea162b8bc80806639
Also cleaned up the comments and the imports slightly. Change-Id: Ieea8af1914ff2f78764d33a9ce6b56621c809fcf