Fix #2415185 (Email disappears after a while)

* Exchange account validation tests security policies by sending a
  FolderSync command and determining whether this generates an
* Unfortunately, we use the real deviceId when sending the command
  and this causes the next real sync to fail such that all data is
  wiped and reloaded (the bug)
* The fix is to use a false device id while doing validation

Bug: 2415185
Change-Id: Ibe577e36f770d737ba5952b347aa0d73bda3568a
2 files changed