roles: bootstrap-os: Use 'hostname' command on Tumbleweed
roles: bootstrap-os: Use 'hostname' command on Tumbleweed

openSUSE Tumbleweed is having the same problems with CoreOS when it
comes to using the hostname ansible module (#1588, #1600) so we need
to apply a similar workaround.

Co-authored-by: Markos Chandras <33d8b43ece1558bd62b361ce5e954c5d9a97a7a2@suse.de>
Link: http://bugzilla.opensuse.org/show_bug.cgi?id=997614

kubernetes-sigs/kubespray,kubernetes-incubator/kargo,Atoms/kubespray,insequent/kargo,kubernetes-incubator/kargo,kubernetes-sigs/kubespray,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kubespray,insequent/kargo,kubespray/kargo,Atoms/kubespray,Atoms/kubespray,Atoms/kubespray,kubespray/kargo