feat(timepicker): avoid allowing to tab to controls

- Prevent the ability to tab to timepicker controls, leaving incrementing/decrementing to keyboard actions on the individual inputs

Closes #5930

template/timepicker/timepicker.html

@@ -1,11 +1,11 @@
 <table class="uib-timepicker">
   <tbody>
     <tr class="text-center" ng-show="::showSpinners">
-      <td class="uib-increment hours"><a ng-click="incrementHours()" ng-class="{disabled: noIncrementHours()}" class="btn btn-link" ng-disabled="noIncrementHours()" tabindex="{{::tabindex}}"><span class="glyphicon glyphicon-chevron-up"></span></a></td>
+      <td class="uib-increment hours"><a ng-click="incrementHours()" ng-class="{disabled: noIncrementHours()}" class="btn btn-link" ng-disabled="noIncrementHours()" tabindex="-1"><span class="glyphicon glyphicon-chevron-up"></span></a></td>
       <td>&nbsp;</td>
-      <td class="uib-increment minutes"><a ng-click="incrementMinutes()" ng-class="{disabled: noIncrementMinutes()}" class="btn btn-link" ng-disabled="noIncrementMinutes()" tabindex="{{::tabindex}}"><span class="glyphicon glyphicon-chevron-up"></span></a></td>
+      <td class="uib-increment minutes"><a ng-click="incrementMinutes()" ng-class="{disabled: noIncrementMinutes()}" class="btn btn-link" ng-disabled="noIncrementMinutes()" tabindex="-1"><span class="glyphicon glyphicon-chevron-up"></span></a></td>
       <td ng-show="showSeconds">&nbsp;</td>
-      <td ng-show="showSeconds" class="uib-increment seconds"><a ng-click="incrementSeconds()" ng-class="{disabled: noIncrementSeconds()}" class="btn btn-link" ng-disabled="noIncrementSeconds()" tabindex="{{::tabindex}}"><span class="glyphicon glyphicon-chevron-up"></span></a></td>
+      <td ng-show="showSeconds" class="uib-increment seconds"><a ng-click="incrementSeconds()" ng-class="{disabled: noIncrementSeconds()}" class="btn btn-link" ng-disabled="noIncrementSeconds()" tabindex="-1"><span class="glyphicon glyphicon-chevron-up"></span></a></td>
       <td ng-show="showMeridian"></td>
     </tr>
     <tr>
@@ -23,11 +23,11 @@
       <td ng-show="showMeridian" class="uib-time am-pm"><button type="button" ng-class="{disabled: noToggleMeridian()}" class="btn btn-default text-center" ng-click="toggleMeridian()" ng-disabled="noToggleMeridian()" tabindex="{{::tabindex}}">{{meridian}}</button></td>
     </tr>
     <tr class="text-center" ng-show="::showSpinners">
-      <td class="uib-decrement hours"><a ng-click="decrementHours()" ng-class="{disabled: noDecrementHours()}" class="btn btn-link" ng-disabled="noDecrementHours()" tabindex="{{::tabindex}}"><span class="glyphicon glyphicon-chevron-down"></span></a></td>
+      <td class="uib-decrement hours"><a ng-click="decrementHours()" ng-class="{disabled: noDecrementHours()}" class="btn btn-link" ng-disabled="noDecrementHours()" tabindex="-1"><span class="glyphicon glyphicon-chevron-down"></span></a></td>
       <td>&nbsp;</td>
-      <td class="uib-decrement minutes"><a ng-click="decrementMinutes()" ng-class="{disabled: noDecrementMinutes()}" class="btn btn-link" ng-disabled="noDecrementMinutes()" tabindex="{{::tabindex}}"><span class="glyphicon glyphicon-chevron-down"></span></a></td>
+      <td class="uib-decrement minutes"><a ng-click="decrementMinutes()" ng-class="{disabled: noDecrementMinutes()}" class="btn btn-link" ng-disabled="noDecrementMinutes()" tabindex="-1"><span class="glyphicon glyphicon-chevron-down"></span></a></td>
       <td ng-show="showSeconds">&nbsp;</td>
-      <td ng-show="showSeconds" class="uib-decrement seconds"><a ng-click="decrementSeconds()" ng-class="{disabled: noDecrementSeconds()}" class="btn btn-link" ng-disabled="noDecrementSeconds()" tabindex="{{::tabindex}}"><span class="glyphicon glyphicon-chevron-down"></span></a></td>
+      <td ng-show="showSeconds" class="uib-decrement seconds"><a ng-click="decrementSeconds()" ng-class="{disabled: noDecrementSeconds()}" class="btn btn-link" ng-disabled="noDecrementSeconds()" tabindex="-1"><span class="glyphicon glyphicon-chevron-down"></span></a></td>
       <td ng-show="showMeridian"></td>
     </tr>
   </tbody>