doc: correct meaning of 'pool' in crush

This was recently made less confusing by renaming the default crush
'pool' type to 'root'. Use this terminology everywhere as well.
This was not in argonaut, so perhaps this should delay being merged.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>

Conflicts:

	doc/rados/operations/add-or-rm-osds.rst
	doc/rados/operations/crush-map.rst
doc: draft bobtail release notes

Signed-off-by: Sage Weil <sage@inktank.com>
doc/release-notes: 'mon max pool pg num'

Signed-off-by: Sage Weil <sage@inktank.com>
doc/release-notes: don't use format 2 rbd images until after osds upgrade

Signed-off-by: Sage Weil <sage@inktank.com>
release notes: Mention new cephtool commands

ceph osd ls and ceph tell osd.N version are new.  Mention their use
for verifying that all OSDs are upgraded in the note about rbd
formats.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
release-notes: remove warning about osd caps

This was only an issue from 0.49-0.52 upgrading to 0.53+

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
release-notes: pgnum is required now

This should have been in the 0.55 release notes.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
release-notes: fix typos

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
release-notes: remove bug fix that does not affect argonaut

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
release-notes: add more user-visible changes

These are from looking through the shortlog from 0.48.2..next.
The description of the min_size defaults could probably be improved.
I did not look closely at radosgw or cephfs changes.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
release-notes: rgw logging now off by default

Signed-off-by: Sage Weil <sage@inktank.com>
doc/release-notes: document new 'max open files' default

Signed-off-by: Sage Weil <sage@inktank.com>
os/FileJournal: logger is optional

Signed-off-by: Sage Weil <sage@inktank.com>
doc: Added upgrade link to index.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Minor edit.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added a new upgrade document.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc/install/upgrading: edits to upgrade document

Signed-off-by: Sage Weil <sage@inktank.com>
doc/release-notes: link to upgrade doc

Signed-off-by: Sage Weil <sage@inktank.com>
Merge remote-tracking branch 'gh/wip-bobtail-docs'
doc: Fixed typo, clarified usage.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>