Merge ~steverydz/maas:pod-refresh-message into maas:master

[Steve Rydz]

LP: #1815754 - Add pod refresh message to pod list

Done:
Add pod refresh message to pod listing page so it matches pod summary page

QA steps:
- Go to pod summary and refresh pod. See the message that appears at the top of the screen.
- Go to pod listing and refresh one or more pods. See the message that appears at the top of the screen.

Screenshots:
https://user-images.githubusercontent.com/501889/53111329-cae3a980-3534-11e9-9616-c0fe2f01e9fb.png
https://user-images.githubusercontent.com/501889/53111330-cae3a980-3534-11e9-8182-24027b202589.png

[Anthony Dillon (ya-bo-ng)]

Nice LGTM +1

review: Approve

[MAAS Lander (maas-lander)]

UNIT TESTS
-b pod-refresh-message lp:~steverydz/maas/+git/maas into -b master lp:~maas-committers/maas

STATUS: SUCCESS
COMMIT: 912afe58c37b63c8845c6f5933c1174a875b2ef0

review: Approve

diff --git a/src/maasserver/static/partials/pods-list.html b/src/maasserver/static/partials/pods-list.html
index bf5287b..0cbbe50 100644
--- a/src/maasserver/static/partials/pods-list.html
+++ b/src/maasserver/static/partials/pods-list.html
@@ -31,6 +31,14 @@
                     <span data-ng-pluralize count="action.progress.errors" when="{'one': 'pod', 'other': 'pods'}"></span>,
                     see listing for specific error for each pod.
                 </p>
+
+                <div data-ng-if="action.option.name === 'refresh'" class="col-8">
+                    <p class="u-remove-max-width u-align--left">
+                        Refreshing <span data-ng-if="selectedItems.length === 1">this pod</span><span data-ng-if="selectedItems.length > 1">these pods</span> will cause MAAS to recalculate usage metrics, update information about storage pools,
+                        and commission any machines present in <span data-ng-if="selectedItems.length === 1">the pod</span><span data-ng-if="selectedItems.length > 1">the pods</span> that are not yet known to MAAS.
+                    </p>
+                </div>
+
                 <button class="p-button--base is-inline" type="button" data-ng-click="actionCancel()">Cancel</button>
                 <button class="is-inline" data-ng-class="action.option.name === 'delete' ? 'p-button--negative' : 'p-button--positive'" data-ng-click="actionGo()" data-ng-if="!hasActionsFailed()">
                     <span data-ng-if="action.option.name === 'refresh'">Refresh {$ selectedItems.length $}