End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 3.6.xE for Cisco Catalyst 4500-E/X, 3850, 3650 Series Switches and Cisco IOS 15.2(2)E for Cisco Catalyst 2960-X/XR, 2960-S, 2960-Plus, 2960-C, 3750-X, 3560-X/C, and 4900 Series Switches