use sles12-beta5 image for connect testing
update sles12-beta5 image id
Merge pull request #63 from SUSE/review_140417_use_sles12_beta5_image_for_connect_testing

[Review] Request from 'vlewin' @ 'SUSE/connect/review_140417_use_sles12_beta5_image_for_connect_testing'