Revert "Add python-tasklib to centos.ks.erb/ubuntu_packages"
 

Closes-bug: #1383652

This reverts commit f9ba58f8881ac68d386e1dba04046b5af57e5433.

Change-Id: I39237e0e9a5b5aef9a89a0a37d031be9093d3edb
Merge "Revert "Add python-tasklib to centos.ks.erb/ubuntu_packages"  "