Updated flagmappings and tables for neutron

Import results of the autohelp.py tool for neutron.

Note: I used a non-published version of autohelp.py, with the following patches:
https://review.openstack.org/#/c/79076/
https://review.openstack.org/#/c/78138/

Change-Id: Ic002557a2b44222f4f3307e70eacd2d2391b8d18
Add missing OpenStack Compute tables

A number of tables were being generated but not listed in the guide and
have now been added. Additional edits were also made to ensure the
tables are listed alphabetically based on group name, this was largely
already being applied with one or two notable discrepancies.

Change-Id: I01b030bf8c3e61ea0d0031d6a16818c5bac0d1d6
Merge "Add missing OpenStack Compute tables"
Merge "Updated flagmappings and tables for neutron"