software/erp5testnode: Add theia resiliency test

software/erp5testnode/testsuite/theia.cfg

+[buildout]
+extends =
+   ../../theia/development.cfg
+   testsuite.cfg
+
+parts += template-erp5testnode
+
+[template-resilient-test]
+filename = instance-resilient-test.cfg.jinja2
+md5sum = be4adbc196f07f5e39ca78401dfa53ec
+
+# We have to use an extra level of indentation here because this is substituted
+# during software buildout to generate instance buildout, but the
+# slapos.recipe.template recipe doing the substitution does string replacements
+# without knowledge of the buildout syntax, so we want the second line to be
+# indented in the final generated instance buildout.
+extra-context =
+    raw slapos_repository_url ${slapos.cookbook-repository:repository}
+        raw slapos_repository_branch ${slapos.cookbook-repository:branch}
+
+[exporter-default-configuration]
+# Define shorter interaction to speed up tests
+backup_wait_time = 1