defaults: resync sample files with actual defaults

defaults: resync sample files with actual defaults

6644dba5e3a46a5a8c1cf7e66b97f7b7d62e8e95 and
1f15a81c480f60bc82bfc3a1aec3fe136e6d3bc4 introduced changes some changes
in defaults variables files but it seems we've forgotten to
regenerate the sample files.
This commit aims to resync the content of `all.yml.sample`,
`mons.yml.sample` and `rhcs.yml.sample`

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
(cherry picked from commit f8260119cd920441fa0b8ae063b3d501899406f7)
Signed-off-by: Sébastien Han <seb@redhat.com>