Use PXF tarball from 5.11.1 release

The PXF tarball is an unversioned component pushing binaries to a
versioned s3 bucket. Therefore to use the same binaries from 5.11.1, it
is necessary to reference the 5X-release pipeline to get the PXF
s3 file version used in the release. This s3 file version can then be
hardcoded in the locations that the artifact is consumed.
Co-authored-by: NKris Macoskey <kmacoskey@pivotal.io>
Co-authored-by: NTrevor Yacovone <tyacovone@pivotal.io>

concourse/pipelines/5X_STABLE-generated.yml

@@ -12,7 +12,7 @@
 ## file (example: templates/gpdb-tpl.yml) and regenerate the pipeline
 ## using appropriate tool (example: gen_pipeline.py -t prod).
 ## ----------------------------------------------------------------------
-## Generated by gen_pipeline.py at: 2018-10-04 18:26:45.535713
+## Generated by gen_pipeline.py at: 2018-10-04 18:37:32.321530
 ## Template file: gpdb-tpl.yml
 ## OS Types: ['centos6', 'centos7', 'sles', 'aix7', 'win', 'ubuntu16']
 ## Test Sections: ['ICW', 'CS', 'MPP', 'MM', 'DPM', 'UD', 'FileRep', 'AA']
@@ -3659,6 +3659,7 @@ jobs:
       trigger: true
     - get: pxf_tarball
       trigger: true
+      version: {version_id: qChkvAhPXzfAkn9ff2k1MwP2n0q8wSSa}
     - get: pxf_infra_src
     - get: centos6-gpdb-dev-pxf-hdp
   - task: test_pxf

concourse/pipelines/templates/gpdb-tpl.yml

@@ -3302,6 +3302,7 @@ jobs:
       trigger: [[ test_trigger ]]
     - get: pxf_tarball
       trigger: [[ test_trigger ]]
+      version: {version_id: qChkvAhPXzfAkn9ff2k1MwP2n0q8wSSa}
     - get: pxf_infra_src
     - get: centos6-gpdb-dev-pxf-hdp
   - task: test_pxf