Add wgImportSources entries for Wikimedia Poland wiki

This patch adds all Polish Wikimedia wikis as import
sources for plwikimedia, the wiki of Wikimedia Poland.

Request confirmed by a member of their Board; see bug
for details.

Bug: 65908
Change-Id: I3b2ec2a282fbcd7f6ed1e4f73791034948641c24
Merge "Add wgImportSources entries for Wikimedia Poland wiki"