radicale2: Update CalDAV/CardDAV server to v2.x

Radicale 2.x adds support for many new clients,
bug-fixes, etc so add v2 of this application.

We do it as a separate package for those not
ready to switch (it's not an straight inplace
upgrade from 1.x).

We do however CONFLICT with 1.x as they can't
be run side-by-side on the same host (without
containers for somesuch).

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

net/radicale2/patches/110-disable-setup_requirements.patch

@@ -0,0 +1,13 @@
+Index: radicale2-python3-2.1.11/setup.py
+===================================================================
+--- radicale2-python3-2.1.11.orig/setup.py
++++ radicale2-python3-2.1.11/setup.py
+@@ -67,7 +67,7 @@ setup(
+     package_data={"radicale": WEB_FILES},
+     entry_points={"console_scripts": ["radicale = radicale.__main__:run"]},
+     install_requires=["vobject>=0.9.6", "python-dateutil>=2.7.3"],
+-    setup_requires=pytest_runner,
++    setup_requires=[],
+     tests_require=tests_require,
+     extras_require={
+         "test": tests_require,