- make the SyncManager add periodic syncs when it upgrades from a

  version of the accounts.xml file that pre-dated periodic syncs,
  e.g. eclair or early froyo. http://b/2515823
- make the AccountManagerService dump() use a getAccounts call that
  doesn't check the GET_ACCOUNTS permission to make it useful
  in "adb bugreport"
- add some logging to SyncManager to help track down a problem

Change-Id: Icb646909074e2d327d71f6bb39cf06b6fac29e77