v17.2.8
doc/start: add vstart install guide
doc/start/ceph.conf: trim the sample ceph.conf file
docs: Add information about OpenNebula integration
doc/start: update mailing list links
doc/start: fix wording & syntax
doc/start: remove "intro.rst"
doc/start: remove mention of Centos 8 support
doc: remove references to ceph-deploy