LAVA: Add upgrade path test suite

Upgrade path tests start with an initial deployment (done by a LAVA
deploy action) and install a list of OTA images on this build. Each OTA
image installation is validated by checking the resulting build
fingerprint reported by the device. Additionally, Sanity Check can be
executed on each build.

Issue: INFRA-30
Issue: INFRA-136
Change-Id: I92b8eabba07b5409dc7c0033fc4a7354aea1f61b
Depends-On: Iad5f3b61bff62b020e6dced0fbea6bb23999268b
diff --git a/lava/requirements.txt b/lava/requirements.txt
index bc18532..78e7ba7 100644
--- a/lava/requirements.txt
+++ b/lava/requirements.txt
@@ -1 +1,2 @@
-Jinja2==2.8
+Jinja2~=2.10
+PyYAML~=3.13