Adds migration engine for peewee ORM

bug 590

Change-Id: If6752715d455cbeb3dc2633e9b62f79360fef767
Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
diff --git a/debian/python3-osm-policy-module.postinst b/debian/python3-osm-policy-module.postinst
index 253eaaa..fe73f0b 100644
--- a/debian/python3-osm-policy-module.postinst
+++ b/debian/python3-osm-policy-module.postinst
@@ -24,9 +24,9 @@
 
 echo "Installing python dependencies via pip..."
 pip3 install aiokafka==0.4.*
-pip3 install peewee==3.1.*
+pip3 install peewee==3.8.*
 pip3 install jsonschema==2.6.*
-pip3 install six==1.11.*
 pip3 install pyyaml==3.*
 pip3 install pymysql
+pip3 install peewee-migrate==1.1.*
 echo "Installation of python dependencies finished"
\ No newline at end of file