docker files: add git in deps list

git is needed to fetch some 3rd parties sources.

Change-Id: If7a8b9b6e35d4bcfa02556b0e9af07f4d4f1b997

docker/Dockerfile_ubuntu_17.04

@@ -20,6 +20,7 @@ RUN apt-get update && \
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y -o Acquire::Retires=10 \
+        git \
         autoconf \
         automake \
         autopoint \

docker/Dockerfile_ubuntu_17.04_i386

@@ -20,6 +20,7 @@ RUN apt-get update && \
 RUN apt-get clean
 RUN apt-get update && \
     apt-get install -y -o Acquire::Retires=10 \
+        git \
         autoconf \
         automake \
         autopoint \