Fixes #4998: Installation section is too hard to follow
Merge pull request #63 from jooooooon/bug_4998/installation_section_is_too_hard_to_follow

Fixes #4998: Installation section is too hard to follow
Merge branch 'branches/rudder/2.6' into branches/rudder/2.9

Conflicts:
	10_install_server/11_install_root_server_debian.txt
	10_install_server/12_install_root_server_sles.txt
	10_install_server/13_install_root_server_centos_rhel.txt