I would start by adding clearfix class to the <div> with panel-heading class. Then, add both panel-title and pull-left to the H4 tag. Then, add padding-top, as necessary.
Here’s the complete code:
<div class="panel panel-default">
<div class="panel-heading clearfix">
<h4 class="panel-title pull-left" style="padding-top: 7.5px;">Panel header</h4>
<div class="btn-group pull-right">
<a href="#" class="btn btn-default btn-sm">## Lock</a>
<a href="#" class="btn btn-default btn-sm">## Delete</a>
<a href="#" class="btn btn-default btn-sm">## Move</a>
</div>
</div>
...
</div>
http://bootply.com/98827