* Zambia, Angola cut GDP forecast because of drought
* Despite resource wealth, agriculture remain big employer
* Normal rains expected for 2013/14 season - famine network
By Olivia Kumwenda-Mtambo and Shrikesh Laxmidas
JOHANNESBURG/LUANDA Oct 24 (Reuters) - Spells of drought in southern African this year have hit agricultural output and hurt economic growth in countries such as Zambia ...