chore(database): update wal-e to v0.8c2

See wal-e/wal-e@c16e58a...v0.8c2

Author: mboersma

database/build.sh

@@ -39,7 +39,7 @@ cd /tmp
 git clone https://github.com/wal-e/wal-e.git
 
 cd /tmp/wal-e
-git checkout c16e58a
+git checkout v0.8c2
 
 pip install .