We have made os-xenapi repository to deal with XenServer Dom0
specific functions, this patch is to change neutron to use
os-xenapi when XenServer is hypervisor and move the building
RPM scripts into os-xenapi repo
Depends-On: I8a31c81d9475387fe4ed7030b70b26098e588771
Change-Id: Ia958c366189386b1b5abbadbb4d74950aaa23bb2