Adds a missing dependency, bump autest version

(cherry picked from commit e2669fb2a32c1da212a753b9afeb7d058e1c5bd3)

 Conflicts:
	tests/bootstrap.py
diff --git a/tests/bootstrap.py b/tests/bootstrap.py
index 0c472cd..892345e 100755
--- a/tests/bootstrap.py
+++ b/tests/bootstrap.py
@@ -26,12 +26,13 @@
 import sys
 
 pip_packages = [
-    "autest==1.7.0",
+    "autest==1.7.3",
     "hyper",
     "requests",
     "dnslib",
     "httpbin",
-    "traffic-replay" # this should install TRLib, MicroServer, MicroDNS, Traffic-Replay
+    "gunicorn",
+    "traffic-replay"  # this should install TRLib, MicroServer, MicroDNS, Traffic-Replay
 ]