Adds osm-common dependency

Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
Change-Id: I3fffdccba381b298d6d6d245d00f6db6b395b6a6
diff --git a/policy_module/Dockerfile b/policy_module/Dockerfile
index 6e93b30..553ed7b 100644
--- a/policy_module/Dockerfile
+++ b/policy_module/Dockerfile
@@ -25,7 +25,7 @@
 LABEL authors="Benjamín Díaz"
 
 RUN apt-get --yes update \
- && apt-get --yes install python3 python3-pip libmysqlclient-dev \
+ && apt-get --yes install python3 python3-pip libmysqlclient-dev git \
  && pip3 install pip==9.0.3
 
 COPY requirements.txt /policy_module/requirements.txt