Test whether any part of the new configs location is working.

I don't think if things were working correctly, it would not be necessary to put this here but we
need to test whether this is working at all.

repos/system_upgrade/common/actors/rpmtransactionconfigtaskscollector/configs/rpm.py

@@ -0,0 +1,60 @@
+"""
+Configuration keys for dnf transactions.
+"""
+
+from leapp.models import fields
+from leapp.actors.configs import Config
+
+
+### Nested containers?
+### Duplication of default value in type_ and Config.  If we eliminate that, we need to extract default from the type_ for the documentation.
+### We probably want to allow dicts in Config.  But IIRC, dicts were specifically excluded for model fields.  Do we need something that restricts where fields are valid?
+### Test that type validation is strict.  For instance, giving an integer like 644 to a field.String() is an error.
+class Transaction_ToInstall(Config):
+    section = "transaction"
+    name = "to_install"
+    type_ = fields.List(fields.String(), default=[])
+    default = []
+    description = """
+        List of packages to be added to the upgrade transaction.
+        Signed packages which are already installed will be skipped.
+    """
+
+
+class Transaction_ToKeep(Config):
+    section = "transaction"
+    name = "to_keep"
+    type_ = fields.List(fields.String(), default=[
+        "leapp",
+        "python2-leapp",
+        "python3-leapp",
+        "leapp-repository",
+        "snactor",
+    ])
+    default = [
+        "leapp",
+        "python2-leapp",
+        "python3-leapp",
+        "leapp-repository",
+        "snactor",
+    ]
+    description = """
+        List of packages to be kept in the upgrade transaction. The default is
+        leapp, python2-leapp, python3-leapp, leapp-repository, snactor. If you
+        override this, remember to include the default values if applicable.
+    """
+
+
+class Transaction_ToRemove(Config):
+    section = "transaction"
+    name = "to_remove"
+    type_ = fields.List(fields.String(), default=[
+        "initial-setup",
+    ])
+    default = ["initial-setup"]
+    description = """
+        List of packages to be removed from the upgrade transaction. The default
+        is initial-setup which should be removed to avoid it asking for EULA
+        acceptance during upgrade. If you override this, remember to include the
+        default values if applicable.
+    """