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Prepare 4.0.3-rc2 (proper.)
The other 4.0.3-rc2 tag is lacking some commits and should not be used.
This is the tag of the proper Varnish 3.0.6 release.
The "varnish-3.0.6" tag was made in error to point to the -rc1 version.
Add forgotten 3.0.6 tag.