Add script to build OOM helm chart and fix ansible in test-requirements.txt

Change-Id: I993859ac17acde54b40140824d6cf07cf4a8ffb1
Signed-off-by: Cian Johnston <cian.johnston@est.tech>
diff --git a/test-requirements.txt b/test-requirements.txt
index 13213c7..5222a4e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,6 +4,7 @@
 #-------------------------------------------------------------------------------
 
 # NOTE: engine test requirements
+ansible==2.9.6
 tox==3.14.3
 ansible-lint==4.1.0
 yamllint==1.19.0