Publish networking guide versioned

Publish networking guide as draft, so that we can version it.

Update introduction to mention that guide targets Mitaka release.

Change-Id: Iff7a34681a6562f1dfe1e311ca0fbab3534b58e8
implements: bp networkguide-versioning

doc/networking-guide/source/index.rst

@@ -13,8 +13,7 @@ Abstract
 This guide targets OpenStack administrators seeking to deploy and
 manage OpenStack Networking (neutron).
 
-This guide documents OpenStack Liberty, OpenStack Kilo, and OpenStack
+This guide documents the OpenStack Mitaka release.
-Juno releases.
 
 .. warning:: This guide is a work-in-progress and changing rapidly
    while we continue to test and enhance the guidance. Please note

tools/build-all-rst.sh

@@ -11,7 +11,7 @@ if [[ $# > 0 ]] ; then
     fi
 fi
 
-for guide in user-guide user-guide-admin networking-guide admin-guide-cloud \
+for guide in user-guide user-guide-admin admin-guide-cloud \
     contributor-guide image-guide arch-design; do
     tools/build-rst.sh doc/$guide $GLOSSARY --build build \
         --target $guide $LINKCHECK
@@ -20,7 +20,9 @@ for guide in user-guide user-guide-admin networking-guide admin-guide-cloud \
 done
 
 # Draft guides
-for guide in config-ref-rst; do
+# This includes guides that we publish from stable branches
+# as versioned like the networking-guide.
+for guide in config-ref-rst networking-guide; do
     tools/build-rst.sh doc/$guide --build build \
         --target "draft/$guide" $LINKCHECK
 done