[NAN] Print latency statistics for message transmission

(cherry-pick of commit 2494f8b62e4e1969206133df376d9c8229b43c64)

Bug: 31940045
Test: integration tests pass
Change-Id: I436a9ba9977c515e16d608dd7c8e71dd7470e976
diff --git a/acts/framework/setup.py b/acts/framework/setup.py
index 2f4de72..f143547 100755
--- a/acts/framework/setup.py
+++ b/acts/framework/setup.py
@@ -33,6 +33,7 @@
 
 if sys.version_info < (3, ):
     install_requires.append('enum34')
+    install_requires.append('statistics')
     # "futures" is needed for py2 compatibility and it only works in 2.7
     install_requires.append('futures')