[1901] Sync the new children records from a Blocked Device

5 commits:

Do not download children after syncing if device is blacklisted.
Refactored synchronization process.
#1901 Ernesto/Rebecca - Changed API call for blacklisted device to a … 
Merge remote-tracking branch 'upstream/master'
#1901 Rebecca, Ernesto Using device service on syncing to check wheth…