ParanoidOTA: Don't show downloads in the system's Download UI

Downloads initiated via ParanoidOTA should not be listed 
in the Download UI just like Play Store downloads are not 
shown.

Change-Id: I0f7f5032542efb4c56c7b85eabde5918dd96c1bb
Signed-off-by: Parthipan Ramesh <parthipan.ramesh@gmail.com>
ParanoidOTA: Fixed force close when recreating activity

ParanoidOTA force closes if the activity gets recreated. You can enable "Don't
keep activities" in the developer options to force the situation.

PS2: Removed unused import from Log
PS3: Better approach

Change-Id: I4101418b4919ccfa168c73685268709341f65766
Signed-off-by: Parthipan Ramesh <parthipan.ramesh@gmail.com>
Merge "ParanoidOTA: Don't show downloads in the system's Download UI" into kitkat
Merge "ParanoidOTA: Fixed force close when recreating activity" into kitkat