Revisions related to http-addr

[jseldess]

This PR contains revisions/clarifications around the new --http-addr flag. It also removes instructions about ssh tunneling, as requested by @tamird here.

Also, this PR tries to clarify what --host defaults to, depending on scenario. Fixes #446

HTTP version available here: http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/b379df2ae3f552cff5fea8bbb13a0d3178206c35

@tamird, @glycerine, PTAL

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This change is

[glycerine]

Obviously I felt that the ssh tunnel part was essential, else I would not have included it.

The only benefit obtained from removing the ssh hints is to make getting started either insecure or much harder. Hence that threatens usability and adoption.

[tamird]

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Reviewed 4 of 4 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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manual-deployment.md, line 227 [r1] (raw file):

<img src="images/admin_ui.png" alt="CockroachDB Admin UI" style="border:1px solid #eee;max-width:100%" />

{{site.data.alerts.callout_info}}In cases where you set <code>--http-addr</code> to <code>localhost</code> and need to access the Admin UI from a machine separate from the cluster, you can use SSH to tunnel from the machine to a node.{{site.data.alerts.end}}  

s/from the cluster//

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Comments from Reviewable

[jseldess]

Review status: 3 of 4 files reviewed at latest revision, 1 unresolved discussion, some commit checks pending.

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manual-deployment.md, line 227 [r1] (raw file):

Previously, tamird (Tamir Duberstein) wrote…

s/from the cluster//

Done.

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Comments from Reviewable

[jseldess]

@glycerine, after talking with @tamird and @bdarnell about this, the consensus was to leave explicit ssh tunnel instructions out since we want our docs to focus on cockroachdb and not general devops, and since we're not production ready yet anyway. Also, we do plan on improving UI security. That said, if you think we need another note somewhere suggesting tunneling, please let me know.

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Review status: 3 of 4 files reviewed at latest revision, 1 unresolved discussion.

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Comments from Reviewable