Tunning max allowed background services

The serialize running of background services feature
delay some services startup when system bootup, and
lead some abnormal behaivor at the early of system startup.
Tunning will be disabled after system complete bootup.

Change-Id: I834607d9156253bee13848586a8136e24760fdf4
Fix crash when clicking a file from recents or downloads

Change-Id: I6e1693d1d9f433b6baf25d3033245a56817ec16a