core: Upgrade PowerMock to 1.5
core: Upgrade PowerMock to 1.5

Upgraded PowerMock to 1.5 in order to support a future move to Java 7.

This change is required since PowerMock 1.4.10 uses javassit 3.15.0-GA,
which does not handle Java 7's byte-code properly.
PowerMock 1.5 upgrades the dependency to javassit 3.17.1-GA, which can
handle the new bytcode instructions.

Change-Id: Ia3799efcc82e04b0a2aad7b2735f32ace7e10bb0
Signed-off-by: Allon Mureinik <abc9ddaceaf0c059a5d9bc2aed71f25cb5370dba@redhat.com>

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