Adds example OVS tunnel configuration

Adds example GRE/VXLAN tunnel configuration for Open vSwitch
deployments

Change-Id: I8494e9172489578dd9c0b515e7fbf9ee060273ae
Closes-Bug: 1301102
Flatten post-install steps for swift install

Post-install steps section is an old label from the rpevious install
guide layout. This change bring swifts in-line with other parts of
the guide, which use the new layout.

Existing content labels do not change, meaning they are still
searchable and linkable as before, but an htaccess modification
was added for the index page.

Change-Id: I8ac3f93b70928f5ce07203ff30a5d59fb927d72e
Merge "Adds example OVS tunnel configuration"
Merge "Flatten post-install steps for swift install"
Imported Translations from Transifex

Change-Id: I159e42a34dcc893aa04117aff8f1bff025ce9ade