packaging: Added missing maven BuildRequires (#807761)
packaging: Added missing maven BuildRequires (#807761)

https://bugzilla.redhat.com/807761

The ovirt-engine spec file did not previously contain a BuildRequires
statement for the maven package. As a result in mock environments the
build failed with an error when attempting to call the 'mvn' binary.

On Fedora 15/16/17 systems the maven package installs Maven 3, and
also provides the 'mvn' binary.

Change-Id: Ic74a183bce01830a70d18f383b9ff1d2b7e4086e

eayun/ovirt-engine,OpenUniversity/ovirt-engine,eayun/ovirt-engine,OpenUniversity/ovirt-engine,walteryang47/ovirt-engine,zerodengxinchao/ovirt-engine,derekhiggins/ovirt-engine,derekhiggins/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,OpenUniversity/ovirt-engine,zerodengxinchao/ovirt-engine,halober/ovirt-engine,zerodengxinchao/ovirt-engine,halober/ovirt-engine,derekhiggins/ovirt-engine,yingyun001/ovirt-engine,halober/ovirt-engine,halober/ovirt-engine,OpenUniversity/ovirt-engine,yingyun001/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,walteryang47/ovirt-engine,derekhiggins/ovirt-engine,yapengsong/ovirt-engine,yapengsong/ovirt-engine,yapengsong/ovirt-engine,yingyun001/ovirt-engine,eayun/ovirt-engine,OpenUniversity/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,walteryang47/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,eayun/ovirt-engine