PMML: install pmml module in HAWQ

Changes:
- add one line to HAWQ’s Modules.yml

Author: Feng, Xixuan (Aaron)

src/ports/hawq/1.2/config/Modules.yml

@@ -25,6 +25,7 @@ modules:
       depends: ['utilities']
     - name: pca
       depends: ['linalg', 'convex']
+    - name: pmml
     - name: prob
     - name: regress
       depends: ['utilities', 'array_ops']