Avoid sync when UID network is disconnected.
Avoid sync when UID network is disconnected.

During maybeStartNextSyncLocked(), check the network connectivity for
the target UID, and skip when disconnected.

Bug: 4519115
Change-Id: I8adee8e04521cb878624b19e557d01869f984c4c

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base