SLING-311: Content is not installed on every startup anymore (see bug for complete description); add overwrite flag to overwrite content during bundle update.
SLING-311: Content is not installed on every startup anymore (see bug for complete description); add overwrite flag to overwrite content during bundle update.

git-svn-id: c3eb811ccca381e673aa62a65336ec26649ed58c@652295 13f79535-47bb-0310-9956-ffa450edef68

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