Make the namespacing used for --deb-changelog consistent with other
fields - fixes #543
symlinks... fucking symlinks.

get the symlink syntax right.
Merge pull request #546 from igalic/upstart-symlink

symlinks... fucking symlinks.
Merge pull request #544 from torrancew/fix_deb_changelog_path

Make the namespacing used for --deb-changelog consistent with other fields