Enable back button during managed provisioning flow

If pressed in the middle of managed provisioning flow, the
back button will trigger a cancellation confirmation which
allows the user to stop the provisioning and return the device
to its unprovisioned state by deleting the partial profile.

Bug:15928486
Change-Id: I0c4347257dc55fcd1974ac05c248cdee2ea151c2
3 files changed
tree: c9ab5923a9c325bf32403c49da025a0d1a5da08a
  1. res/
  2. src/
  3. Android.mk
  4. AndroidManifest.xml