Add missing role

This role, originally from openstack-infra/project-config,
is used by jobs in this repo.

Change-Id: If6fbf7ff070ff6c4b1ead74724fcaeb8e67ac7d1

roles/submit-subunit-jobs/README.rst

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+Submit a log processing job to the subunit workers.
+
+This role examines all of the files in the log subdirectory of the job
+work dir and any matching filenames are submitted to the gearman queue
+for the subunit log processor.
+
+**Role Variables**
+
+.. zuul:rolevar:: subunit_gearman_server
+   :default: logstash.openstack.org
+
+   The gearman server to use.
+
+.. zuul:rolevar:: subunit_processor_config
+   :type: dict
+
+   The default file configuration for the subunit parser.
+
+   This is a dictionary that contains a single entry:
+
+   .. zuul:rolevar:: files
+      :type: list
+
+      A list of files to search for in the ``work/logs/`` directory on
+      the executor.  Each file will be compared to the entries in this
+      list, and if it matches, a processing job will be submitted to
+      the subunit processing queue, along with the tags for the
+      matching entry.  Order is important: the first matcing is used.
+      This field is list of dictionaries, as follows:
+
+      .. zuul:rolevar:: name
+
+         The name of the file to process.  This is treated as an
+         unanchored regular expression.  To match the full path
+         (underneath ``work/logs``) start and end the string with
+         ``^`` and ``$`` respectively.

roles/submit-subunit-jobs/defaults/main.yaml

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+subunit_gearman_server: logstash.openstack.org
+# For every file found in the logs directory (and its subdirs), the
+# module will attempt to match the filenames below.  If there is a
+# match, the file is submitted to the subunit processing queue, along
+# with the tags for that match.  The first match wins, so be sure to
+# list more specific names first.  The names are un-anchored regular
+# expressions (so if you need to match the root (i.e, the work/logs/
+# directory), be sure to anchor them with ^).
+subunit_processor_config:
+  files:
+    - name: testrepository.subunit
+    - name: karma.subunit

roles/submit-subunit-jobs/meta/main.yaml

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+dependencies:
+  - role: submit-log-processor-jobs

roles/submit-subunit-jobs/tasks/main.yaml

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+- name: Submit subunit processing jobs to log processors
+  when: zuul.pipeline in ['gate', 'periodic', 'post']
+  submit_log_processor_jobs:
+    gearman_server: "{{ subunit_gearman_server }}"
+    job: "push-subunit"
+    config: "{{ subunit_processor_config }}"
+    success: "{{ zuul_success }}"
+    host_vars: "{{ hostvars }}"
+    path: "{{ zuul.executor.log_root }}"
+    log_url: "{{ (lookup('file', zuul.executor.result_data_file) | from_json).get('zuul').get('log_url') }}"