DNM: run make check on pull requests

Signed-off-by: Loic Dachary <loic@dachary.org>
rex001 to rex004.  lots of cores and lots of ram.  currently used by devs 
for build/test, but i think 3 may be unused at the moment.

On Fri, 5 Dec 2014, Ken Dreyer wrote:

> 
> In ceph-make-check-pull-requests/config/definitions/ceph-make-check-pull-requests.yml:
> 
> > @@ -0,0 +1,60 @@
> > +- job:
> > +    name: ceph-make-check-pull-requests
> > +    node: gitbuilder-cdep-deb-cloud-precise-amd64-basic
> 
> (What is a Rex node? Is that the new SeaMicro hardware?)
> 
> ?
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