Make swift config tables the source of truth

As discussed on the mailing list, this patch will make the swift
configuration tables found in common a source of truth for the
helptext. The script that generates them has been updated for this,
and will now only add/remove options, update default values, and
replace helptext where it does not exist in the tables. Another
run of the script was done and tables were updated.

Backstory: All projects other than Swift use OpenStack Common for
configuration, and define option, default value and help text in the
code in a way that it's possible to extract.

Since the code is able to act in this way, we can stop maintaining
separate instructive lines for configuration options, and instead
fix any text problems in the code itself. This both improves the
quality of the code and fixes our double maintenance problem.

For swift, we needed a different approach. Unfortunately, I think we
don't have the ability to treat the code as the definitive source and
move all maintenance there. The lack of instruction for every option,
and absence of structure precludes this.

So I wrote some nasty scraping things (from RST and sample conf file)
to seed an initial list of configuration options.

My plan from here was to make the 'update' portion of the script
treat the textual descriptions in common/tables/swift-*.xml as
definitive.

The script would still search the swift code to add or remove
options, so we could guarantee completeness, and after an initial
push to write out proper help text the maintenance becomes far
simpler.

Change-Id: I2464f5c63cb0da110e1871a09a59380dad9b6b27
Remove Social Integration buttons from Guides

pom.xml should not set socialIcons, otherwise the Facebook and
Twitter buttons are shown.

Change-Id: Id69cbcc5fe2fbd59f72dcbd884524424aa6d372f
Closes-Bug: #1221220
Merge "Remove Social Integration buttons from Guides"
Merge "Make swift config tables the source of truth"