Dont add fostered mark on metas added around fostered content.

* The fostered content marker is only needed on fostered content,
  not on meta wrappers added around fostered content.

  This marker was tripping up DSR by dropping valid DSR information
  on transclusion wrappers that surrounded fostered content and
  was causing template encap failures (because of missing DSR).

  Noticed this on enwiki:Public_holidays_in_Switzerland from
  bug 64017.

* Introduces DSR changes on already blacklisted entries.

Change-Id: I14b3a26099ab1e0d510f2a0d1b40cf30987d6f4d
Merge "Dont add fostered mark on metas added around fostered content."