Introduce experimental job to test TinyIPA with less RAM

Running TinyIPA in 256mb of RAM would allow more parallelism, but we
want to ensure that it's sustainable. This would allow us to check to
see if a change would run or not in a 256mb VM.

Change-Id: I2831f32916808870df3b05e96364eb0f62d97d9b
Related-bug: 1581673

jenkins/jobs/devstack-gate.yaml

@@ -689,14 +689,19 @@
               export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_DEPLOY_DRIVER_ISCSI_WITH_IPA=True"
               # Support for non-CoreOS IPA ramdisks was added in Mitaka
               if [ "$ZUUL_BRANCH" != "stable/kilo" -a "$ZUUL_BRANCH" != "stable/liberty" ] ; then
-                  export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_RAMDISK_TYPE={ramdisk-type}"
                   # Standardize VM size for each supported ramdisk
                   case "{ramdisk-type}" in
                       'tinyipa')
                           export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_VM_SPECS_RAM=384"
+                          export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_RAMDISK_TYPE=tinyipa"
+                          ;;
+                      'tinyipa256')
+                          export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_VM_SPECS_RAM=256"
+                          export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_RAMDISK_TYPE=tinyipa"
                           ;;
                       'coreos')
                           export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_VM_SPECS_RAM=1280"
+                          export DEVSTACK_LOCAL_CONFIG+=$'\n'"IRONIC_RAMDISK_TYPE=coreos"
                           ;;
                   # if using a ramdisk without a known good value, use the devstack
                   # default by not exporting any value for IRONIC_VM_SPECS_RAM
@@ -891,6 +896,45 @@
       - devstack-logs
       - console-log
 
+- job-template:
+    name: '{pipeline}-tempest-dsvm-ironic-pxe_ipa-tinyipa256-src{job-suffix}'
+    node: '{node}'
+
+    wrappers:
+      - build-timeout:
+          timeout: 75
+      - timestamps
+
+    builders:
+      - print-template-name:
+          template-name: "{template-name}"
+      - link-logs
+      - net-info
+      - devstack-checkout
+      - devstack-virtual-ironic:
+          postgres: 0
+          build-ramdisk: 1
+          deploy_driver: pxe_ssh
+          ephemeral-size: 1
+          deploy-with-ipa: 1
+          client-from-source: 0
+          ironic-lib-from-source: 0
+          pyghmi-from-source: 0
+          virtualbmc-from-source: 0
+          ipxe-enabled: 1
+          inspector-enabled: 0
+          inspector-auto-discovery: 0
+          tempest-regex: ironic
+          branch-override: '{branch-override}'
+          ramdisk-type: 'tinyipa256'
+          gate-tempest-full: 0
+          bm-vm-count: 1
+          multitenant-network: 0
+
+    publishers:
+      - devstack-logs
+      - console-log
+
 - job-template:
     name: '{pipeline}-tempest-dsvm-ironic-pxe_ipa-full{job-suffix}'
     node: '{node}'

jenkins/jobs/projects.yaml

@@ -2720,6 +2720,11 @@
           node: ubuntu-trusty
           job-suffix: ''
           branch-override: default
+      - '{pipeline}-tempest-dsvm-ironic-pxe_ipa-tinyipa256-src{job-suffix}':
+          pipeline: gate
+          node: ubuntu-trusty
+          job-suffix: ''
+          branch-override: default
       - '{pipeline}-tempest-dsvm-ironic-parallel{job-suffix}':
           pipeline: gate
           node: ubuntu-trusty

zuul/layout.yaml

@@ -7104,6 +7104,8 @@ projects:
       - gate-tempest-dsvm-ironic-agent_ssh-tinyipa-src
       - gate-tempest-dsvm-ironic-pxe_ipa-coreos-src
       - gate-tempest-dsvm-ironic-pxe_ipa-tinyipa-src
+    experimental:
+      - gate-tempest-dsvm-ironic-pxe_ipa-tinyipa256-src
     post:
       - ironic-python-agent-buildimage-coreos
       - ironic-python-agent-buildimage-tinyipa