Revert "Pin rdopkg<0.47.0 due to backward incompatibility"

We've tested the latest rdopkg code in https://softwarefactory-project.io/r/13421.
Let's revert the pin and then tag a new DLRN release.

This reverts commit 3403ba6.

Change-Id: I7469da728dcf038b7ecbbec80403d3ca3b3028db

requirements.txt

@@ -6,8 +6,7 @@ six
 SQLAlchemy
 PyMySQL
 PyYAML
-# rdopkg-0.47.0 switches to distroinfo - changes needed
-rdopkg>=0.45.0,<0.47.0
+rdopkg>=0.45.0
 distroinfo
 alembic>=0.7.0
 renderspec