bless python versions newer than 2.6

Change-Id: Ic4bfb857586f1fd4aa9cfddf5984341a89b0cd4a
Signed-off-by: Li Li <lli5@nvidia.com>
Reviewed-on: http://git-master/r/347711
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Peter Zu <pzu@nvidia.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
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
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>