Zuul: Initial Airship-Pegleg checks

This PS adds the skeleton for a set of zuul checks and gates for
Airship, using the framework from OpenStack-Helm.

Change-Id: I4cc071d0076e265e5c34f15616ccf40c0b3a83a8

.zuul.yaml

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+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- project:
+    check:
+      jobs:
+        - airship-pegleg-linter
+    gate:
+      jobs:
+        - airship-pegleg-linter
+
+- job:
+    name: airship-pegleg-linter
+    description: |
+      Lints all files by checking them for whitespace.
+    run: tools/gate/playbooks/zuul-linter.yaml
+    nodeset: openstack-helm-single-node

tools/gate/playbooks/zuul-linter.yaml

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+# Copyright 2017 The Openstack-Helm Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- hosts: primary
+  tasks:
+    - name: Execute a Whitespace Linter check
+      command: find . -not -path "*/\.*" -not -path "*/doc/build/*" -not -name "*.tgz" -type f -exec egrep -l " +$" {} \;
+      register: result
+      failed_when: result.stdout != ""