added benchmark for neighbor closeness

tests/benchmarks/benchmark-neighbor-closeness.py

@@ -0,0 +1,34 @@
+import sys, os
+sys.path.append(".")
+sys.path.append("src/")
+import unittest, uuid
+import subprocess
+import time
+
+TEST_DIR = 'testdata/%s-%s' % (uuid.uuid4(), os.path.basename(__file__)) + '/'
+print("Test directory:", TEST_DIR)
+os.environ["ONIONR_HOME"] = TEST_DIR
+from utils import createdirs, identifyhome
+from streamfill import identify_neighbors
+
+onions = []
+p = subprocess.Popen(["scripts/generate-onions.py", '50000'],
+                        stdout=subprocess.PIPE,
+                        stderr=subprocess.PIPE)
+for line in iter(p.stdout.readline, b''):
+    line = line.decode()
+    onions.append(line.strip())
+p.terminate()
+
+p = subprocess.Popen(["scripts/generate-onions.py", '1'],
+                        stdout=subprocess.PIPE,
+                        stderr=subprocess.PIPE)
+for line in iter(p.stdout.readline, b''):
+    us = line.decode().strip()
+p.terminate()
+
+start = time.time()
+identify_neighbors(us, onions, 5)
+print(time.time() - start)
+
+