Serialize installation tests

Due to the way installation of the package works (based on setup.py),
it creates temporary content in a build/ directory at the root of the
repository. This sometimes causes installation to fail if another
installation is happening at the same time, which is problematic for
the client/server installation tests.

Until we modernize to a proper pyproject.toml, serialize the installation
tests to ensure they don't fail spuriously.

Author: ldionne

tests/utils/installation-client.shtest

@@ -0,0 +1,17 @@
+# Check that installation using the client requirements works properly.
+#
+# RUN: rm -rf %t.venv
+# RUN: python -m venv %t.venv
+# RUN: cd %{src_root}
+# RUN: %t.venv/bin/python -m pip install -r requirements.client.txt
+# RUN: rm -rf %t.installation
+# RUN: %t.venv/bin/lnt create %t.installation
+
+# Check that installation using the server requirements works properly.
+#
+# RUN: rm -rf %t.venv
+# RUN: python -m venv %t.venv
+# RUN: cd %{src_root}
+# RUN: %t.venv/bin/python -m pip install -r requirements.server.txt
+# RUN: rm -rf %t.installation
+# RUN: %t.venv/bin/lnt create %t.installation