Add note about Linux Bridge MTU Bug w/ VXLAN tun

There's a horrible hard-to-diagnose bug when using vxlan tunelling.

This patch adds a note including the simple workaround.

Change-Id: I20a8ec46a91c7ffe1533338de5968d1b83badb6f
Closes-Bug: 1242534
Document Brocade Networking plug-in

The driver is now part of Networking, update documentation URL
and document how to use it.

Change-Id: Ia611750f25340544e915741f0da7cfeeca0c9595
Closes-Bug: #1097268
Merge "Document Brocade Networking plug-in"
Publish training-guides publicly

Add training-guides link to doc.openstack.org web sites and to
the support appendix.

Update local-files.html to follow the change.

Change-Id: I09f26e0c6f102efc37f7c2028a369567b5b43be7
Merge "Publish training-guides publicly"
Merge "Add note about Linux Bridge MTU Bug w/ VXLAN tun"
Install Guide: Add table documenting reserved UIDs

Add a table documenting the reserved UIDs that are used by
OpenStack.
This is information that belongs IMO into an appendix, let's make
it specific for each distribution.

backport: none
Change-Id: I66f861b4ad84231af5053826dbc47df4d91bc0b9
Closes-Bug: #1239879
Merge "Install Guide: Add table documenting reserved UIDs"