core: check for duplicate upgrade scripts on unix
core: check for duplicate upgrade scripts on unix

The check for duplicate upgrade scripts is implemented as a /bin/bash
script, so there is no point on running it on non-unix machines.

Change-Id: I2f997b63b3342d9fbfe972d6aa2ba7cb29d82ba6
Signed-off-by: Allon Mureinik <abc9ddaceaf0c059a5d9bc2aed71f25cb5370dba@redhat.com>

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