By Abhinav Parmar and Harshita Mary Varghese (Reuters) - Comcast is planning to cut jobs at its biggest unit that houses its Xfinity internet, mobile and pay television business, a source familiar with the matter said on Friday, as the company attempts to centralize operations and bolster its broadband business. Starting January, Comcast will remove a layer between the corporate and regional offices, a shake-up that will streamline the management of the unit but also reduce headcount. The connectivity ...