Added reset to rally commit ID in prepare_env.sh
Added reset to rally commit ID in prepare_env.sh

Change-Id: I0d662409bfde353c8efd2fa3fd8cacf9c849428b
Signed-off-by: jose.lausuch <a4ed9890ad7f6494ac84a749f29a4dc3449a1186@ericsson.com>

opnfv/functest,opnfv/functest,mywulin/functest,mywulin/functest