Post Xenial switch adaptations

Moving to Xenial revealed a problem
with mixing bindep and devstack.
The bindep actually came from using the
install-distro-packages 'builder' which
we do not really want.

Adding devstack logs while at it.

TrivialFix

Change-Id: Id899fc206f8f975abc6c63a034edbd8257e5fdde

jenkins/jobs/storlets.yaml

@@ -4,7 +4,6 @@
 
     builders:
       - gerrit-git-prep
-      - install-distro-packages
       - shell: |
           #!/bin/bash -xe
           tests/setup_functional_test.sh
@@ -12,4 +11,5 @@
 
     publishers:
       - test-results
+      - devstack-logs
       - console-log