Display confirmation message when Adding new PXE Server #2893
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https://bugzilla.redhat.com/show_bug.cgi?id=1518142
Screen shot prior to code fix:
![new pxe server added with no confirmation message](https://user-images.githubusercontent.com/552686/33461313-b5c91714-d5e6-11e7-99db-a9866efdfa5d.png)
Screen shot post code fix:
![new pxe server added message post code fix](https://user-images.githubusercontent.com/552686/33461333-c9c85694-d5e6-11e7-8ad9-3050457caada.png)