Add script to release slapos.cookbook

This script everything required to release slapos.cookbook, and verbose additional information to
the user review and push the changes.

This script automatically slapos.cookbook version on update stack/slapos.cfg also, if you want only
release the EGG w/o using it, you can call it using:

 EGG_ONLY=Y bash release-cookbook

else, call it only by 'bash release-cookbook'.

release-cookbook

+#!/bin/bash
+
+git fetch
+
+git checkout master
+git reset origin/master --hard
+git clean -f
+
+# Remove any local tag
+git fetch --prune origin "+refs/tags/*:refs/tags/*"
+rm -rf dist/slapos.cookbook*
+
+# for now this script is hardcoded to release on 1.0.x versions intentionally
+# update to version 2 or 1.1 would require a major reorganisation on the release
+# process
+CURRENT_VERSION=`git tag | grep "^1\+\.0\+\.[0-9]\+$" | sort -t. -k 1,1n -k 2,2n -k 3,3n | tail -1`
+NEXT_MINOR_VERSION=$((`echo $CURRENT_VERSION | cut -f3 -d.`+1))
+NEXT_VERSION=1.0.$NEXT_MINOR_VERSION
+
+CURRENT_EGG_VERSION=`cat setup.py | grep ^version | cut -d\' -f2`
+
+sed -i "s/$CURRENT_EGG_VERSION/$NEXT_VERSION/g" setup.py
+git commit -m "Release slapos.cookbook ($NEXT_VERSION)" setup.py
+
+if [ ! $EGG_ONLY == "Y" ];
+then
+  sed -i "s/slapos.cookbook = $CURRENT_EGG_VERSION/slapos.cookbook = $NEXT_VERSION/g" stack/slapos.cfg
+  sed -i "s/slapos.cookbook==$CURRENT_EGG_VERSION/slapos.cookbook==$NEXT_VERSION/g" stack/slapos.cfg
+  git commit -m "stack/slapos: slapos.cookbook version up ($NEXT_VERSION)" stack/slapos.cfg
+fi
+
+echo "############### Merging into 1.0 and generating the tag ################"
+git checkout 1.0
+git reset --hard origin/1.0 
+git clean -f
+git merge master -m "Update Release Candidate"
+
+# Revert changes from master
+git diff HEAD..master | git apply 
+
+# Download patch to update revisions based on tests
+wget -O update-release.sh https://nexedi.erp5.net/portal_skins/custom/TestResultModule_getReleaseCandidateRevision 
+bash update-release.sh
+git commit -m 'Update git revisions' -a  
+git tag $NEXT_VERSION -m "Release $NEXT_VERSION"
+
+echo "############### Building sdist  ################"
+python setup.py sdist
+
+
+echo "###################################################################"
+echo "You are about to release a new tag, a new version of slapos.cookbook"
+echo " and a new version of SlapOS Software Release"
+echo ""
+echo "Lastest release: $CURRENT_VERSION"
+echo "Next Release to be Tagged: $NEXT_VERSION"
+echo "Current slapos.cookbook version: $CURRENT_EGG_VERSION"
+echo "Next slapos.cookbook to be released: $NEXT_VERSION"
+echo ""
+echo "###################################################################"
+echo ""
+echo ""
+echo "########################################################################"
+echo " Please review the current local changes before continue. Ensure that"
+echo " ALL changes and commits are correct before continue."
+echo ""
+echo " To review master use :: git log master"
+echo " To review 1.0 use    :: git log 1.0"
+echo " To review $NEXT_VERSION use :: git log $NEXT_VERSION"
+echo " To review individual commits :: git show HASH"
+echo ""
+echo ""
+echo "Once everything is ok, please upload slapos.cookbook egg /!\\ BEFORE /!\\" 
+echo "push your changes into the repository. Please use twine for it."
+echo ""
+echo "To upload :: python -m twine upload dist/slapos.cookbook-$NEXT_VERSION*"
+echo "To verify if upload succeed access: https://pypi.org/project/slapos.cookbook/$NEXT_VERSION/"
+echo ""
+echo " More info on twine: https://packaging.python.org/tutorials/packaging-projects/#uploading-the-distribution-archives"
+echo ""
+echo "Once egg is updated please push your changes into main repository:"
+echo ""
+echo " git push origin master 1.0 $NEXT_VERSION"
+echo ""
+echo " !! DO NOT FORGET TO PUSH YOUR CHANGES IN THE END !!"
+echo ""
+echo "###################################################################"
+echo ""