Ignore trailing projects from RC1

Some traiing projects follow the cycle-with-rc model however our doc
and our tools doesn't differentiate them during RC1. These project
doesn't have to be released during RC1. These changes adapt our process
accordingly.

Change-Id: I44040bc040f19a75c468d385395323fe0a1f459a

doc/source/reference/process.rst

@@ -1125,11 +1125,11 @@ R-3 week (RC1 deadline)
        --model cycle-with-intermediary \
        --type horizon-plugin --type other --type service --type tempest-plugin
 
-   - cycle-with-rc deliverables that have not done a RC1 yet, for which
-     a release should be proposed from HEAD, and include stable branch
-     creation. You can list those using::
+   - cycle-with-rc that are not trailing deliverables and that have not done
+     a RC1 yet, for which a release should be proposed from HEAD, and include
+     stable branch creation. You can list those using::
 
-       tox -e venv -- list-deliverables --missing-rc --model cycle-with-rc
+       tools/list_rc1.sh
 
    - Generate patches by using ``process_auto_releases``.
 

tools/list_rc1.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+# Convenience wrapper to show cycle-with-rc non trailing deliverables that
+# have not done a RC1 yet, for which a release should be proposed from HEAD,
+# and include stable branch creation.
+
+TOOLSDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+BASEDIR=$(dirname $TOOLSDIR)
+source $TOOLSDIR/functions
+
+if [[ -z "$VIRTUAL_ENV" ]]; then
+    if [[ ! -d $BASEDIR/.tox/venv ]]; then
+        (cd $BASEDIR && tox -e venv --notest)
+    fi
+    source $BASEDIR/.tox/venv/bin/activate
+fi
+
+# Figure out the current series from the releases directory.
+current_series=$(python -c 'import openstack_releases.defaults; \
+    print(openstack_releases.defaults.RELEASE)')
+if [ -z "$current_series" ]; then
+    echo "Could not determine the current release series."
+    exit 1
+fi
+
+trailing_projects=$(list-deliverables \
+    --missing-rc \
+    --model cycle-with-rc \
+    --type trailing)
+list-deliverables --missing-rc --model cycle-with-rc | \
+    grep -v "${trailing_projects}"