adding maven to ubuntu basebuilds

Change-Id: If924a9753a2696050ac700f5353260e0f865a486
diff --git a/packer/provision/basebuild.sh b/packer/provision/basebuild.sh
index 78d2fa1..9d09504 100644
--- a/packer/provision/basebuild.sh
+++ b/packer/provision/basebuild.sh
@@ -56,6 +56,7 @@
         git \
         less \
         libxml2-utils \
+        maven \
         nodejs \
         npm \
         python \