add exploit payloads

tests/fallocate.py

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+"""
+Description
+    Writing a large file to disk in the jobs directory, exhausting the
+    space will temporarly disable other jobs to be started.
+
+Discovered by
+    Discord     Derpius#9144
+"""
+
+with open("beans","w") as f:
+    n = 2**24
+    f.write("I love beans\n"*n)

tests/fork.py

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+import os
+while True:
+    try:
+        os.fork()
+    except:
+        pass

tests/network.py

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+"""
+Description
+    Accessing external resources could be potentially dangerous
+
+"""
+
+import urllib.request
+contents = urllib.request.urlopen("https://emkc.org").read()

tests/readme.md

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+# Exploit Tests
+
+This directory contains a collection of exploits which have already been patched
+
+Write exploits in any language supported by piston.
+
+Hopefully when running any files in this directory, piston will resist the attack.
+
+Leave a comment in the code describing how the exploit works.

tests/runaway_output.py

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+while True:
+    print("Piston is secure")