[FLINK-3028] [runtime-web] Show cancel button for restarting jobs

This closes apache#1369

flink-runtime-web/web-dashboard/app/partials/jobs/job.jade

@@ -39,7 +39,7 @@ nav.navbar.navbar-default.navbar-fixed-top.navbar-main(ng-if="job")
  .navbar-info.last.first(ng-if="job.duration > -1" title="{{job.duration | humanizeDuration:false}}")
  | {{job.duration | humanizeDuration:true}}
 
- .navbar-info.last.first(ng-if="job.state=='RUNNING' || job.state=='CREATED'")
+ .navbar-info.last.first(ng-if="job.state=='RUNNING' || job.state=='CREATED' || job.state=='RESTARTING'")
  span.navbar-info-button.btn.btn-default(ng-click="cancelJob($event)")
  | Cancel
 

flink-runtime-web/web-dashboard/web/partials/jobs/job.html

@@ -32,7 +32,7 @@
  - 
  {{ job['end-time'] | amDateFormat:'YYYY-MM-DD, H:mm:ss' }}</span></div>
  <div ng-if="job.duration &gt; -1" title="{{job.duration | humanizeDuration:false}}" class="navbar-info last first">{{job.duration | humanizeDuration:true}}</div>
- <div ng-if="job.state=='RUNNING' || job.state=='CREATED'" class="navbar-info last first"><span ng-click="cancelJob($event)" class="navbar-info-button btn btn-default">Cancel</span></div>
+ <div ng-if="job.state=='RUNNING' || job.state=='CREATED' || job.state=='RESTARTING'" class="navbar-info last first"><span ng-click="cancelJob($event)" class="navbar-info-button btn btn-default">Cancel</span></div>
 </nav>
 <nav ng-if="job" class="navbar navbar-default navbar-fixed-top navbar-main-additional">
  <ul class="nav nav-tabs">