Added XML files for default ports sect and tables

This patch adds XML files for:
- brief overview of firewall configuration
- table listing ports used by main openstack components
- table listing ports used by other services required by OpenStack

The resulting section will be added as an appendix to the Config Ref
Guide.

Change-Id: Ib7edf8f827cd0c31c51a9cbdaff475384960c7ee
Related-Bug: #1261617
Minor change to section_cli_nova_boot.xml file

fixed period after example , added commas

Change-Id: I191fb59c83fa91cd94daa9c98714224a08f9794b
Made a small change to section_keystone_certificates-for-pki

Copy edit change - Changed successfully to successful

Change-Id: I4a997b7b3393180b75bb6517a5fe078dfccb4a57
Replace references to Nicira NVP with VMware NSX

Nicira NVP is to be replaced with VMware NSX as
the product has been rebranded.

Partial-implements blueprint nicira-plugin-renaming

Change-Id: I1dd93a52984d473ec6cc5b905867711297495f67
Include BigSwitch plugin options in ML2 page

Adds a link to the Big Switch plugin config
options on the ML2 page since it can be loaded
as an ML2 driver as well.

Change-Id: I6af4a2dfbae16c626e20c89e9edbd6d019ef8027
Implements: blueprint bigswitch-ml2-plugin
Update glossary

Update based on review comments at https://review.openstack.org/#/c/72668/1:
* Remove empty glossentry (except Y - there's no Y entry)
* Remove OSAPI, this is not used anywhere
* Remove duplicated spaces

Change-Id: I188c2422bbbfd08705907788c56ae4af74b8e230
Merge "Made a small change to section_keystone_certificates-for-pki"
Merge "Minor change to section_cli_nova_boot.xml file"
Merge "Replace references to Nicira NVP with VMware NSX"
Merge "Include BigSwitch plugin options in ML2 page"
Merge "Update glossary"
Merge "Added XML files for default ports sect and tables"