Use image from devshift.net Docker registry

[l0rd]

• For che-server image deployment yml files
• For che stacks images in stacks.json

[l0rd]

I've tested successfully that che-server images from devshift.net works well on minishift and osio. The problem is that after commit cd3b12c we cannot retrieve devshift images anymore.

#313 and openshiftio/openshiftio-cico-jobs#284 have not solved the problem: script cico_do_docker_build_tag_push.sh hangs at line https://github.com/redhat-developer/rh-che/blob/master/cico_do_docker_build_tag_push.sh#L68.

I am currently working with @vpavlin to solve this.

[l0rd]

UPDATE: I've currently disabled pushing images to devshift to investigate the problem and it looks like DEVSHIFT_USERNAME and DEVSHIFT_PASSWORD are not set

DEVSHIFT_USERNAME is unset.
DEVSHIFT_PASSWORD is unset.

[l0rd]

This was fixed by #327 but we needed to revert it because of an issue with the lenght of chars in image tag (openshiftio/openshift.io#798). As soon as eclipse-che/che#6245 get merged and a new version of Che is released we should apply c0bcc62 back again.