SEBA-563 fix networkx to version 2.2

Change-Id: Ie4b336ac8694fb9752c7110ee4e27edc67b3bb6f
diff --git a/.gitignore b/.gitignore
index 088aa5e..20ecd3e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,6 +35,7 @@
 venv-xos*
 _book/
 .noseids
+testservice/venv-service
 
 # testing/coverage files
 nose2-junit.xml