dist/debian: install python for git-archive-all

Since git-archive-all is python script, we need to install python if it's
unavailable.

Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Message-Id: <1487054303-11556-1-git-send-email-syuu@scylladb.com>

dist/debian/build_deb.sh

@@ -15,6 +15,9 @@ fi
 if [ ! -f /usr/bin/lsb_release ]; then
     sudo apt-get -y install lsb-release
 fi
+if [ ! -f /usr/bin/python ]; then
+    sudo apt-get -y install python
+fi
 DISTRIBUTION=`lsb_release -i|awk '{print $3}'`
 RELEASE=`lsb_release -r|awk '{print $2}'`
 CODENAME=`lsb_release -c|awk '{print $2}'`