Add P4 connect e2e test against public demo server

Author: sebastianrath

tests_e2e/references/reference_p4_connect.sh_l5

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+//depot/pong/background.jpg#1 - add change 3 (binary+F)
+//depot/pong/build-pong-game.act#1 - add change 3 (text)
+//depot/pong/tutorial-readme.md#1 - add change 3 (text)

tests_e2e/scripts/p4_connect.act

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+editor:
+  version:
+    created: v1.0.0
+entry: start
+type: orchestrator
+nodes:
+  - id: start
+    type: core/start@v1
+    position:
+      x: 0
+      y: 0
+  - id: list-files
+    type: core/p4-run@v1
+    position:
+      x: 200
+      y: 0
+    inputs:
+      command: files
+      args:
+        - "//depot/pong/..."
+  - id: print-result
+    type: core/print@v1
+    position:
+      x: 300
+      y: 0
+    inputs:
+      values[0]: null
+connections:
+  - src:
+      node: list-files
+      port: output
+    dst:
+      node: print-result
+      port: "values[0]"
+executions:
+  - src:
+      node: start
+      port: exec
+    dst:
+      node: list-files
+      port: exec
+  - src:
+      node: list-files
+      port: exec-success
+    dst:
+      node: print-result
+      port: exec

tests_e2e/scripts/p4_connect.sh

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+export P4PORT=ssl:p4demo.actionforge.dev:1666
+export P4USER=guest
+export P4PASSWD=readonly1
+
+#! test actrun ${ACT_GRAPH_FILES_DIR}${PATH_SEPARATOR}p4_connect.act