Add FMF test metadata and scripts

Copy and adjust the browser.sh and run-test.sh scripts from
cockpit-podman, which we have used in Fedora/RHEL dist-git gating and
packit tests for a while.

test/browser/main.fmf

@@ -0,0 +1,13 @@
+summary:
+    Run browser integration tests on the host
+require:
+  - cockpit-starter-kit
+  - cockpit-ws
+  - cockpit-system
+  - git
+  - libvirt-python3
+  - make
+  - npm
+  - python3
+test: ./browser.sh
+duration: 60m