qemu: add macvlan delete to qemuDomainAttachNetDevice cleanup
qemu: add macvlan delete to qemuDomainAttachNetDevice cleanup

If an error occurs during qemuDomainAttachNetDevice after the macvtap
was created in qemuPhysIfaceConnect, the macvtap device gets left behind.
This patch adds code to the cleanup routine to delete the macvtap.

Signed-off-by: Matthew Rosato <9195a9dfe20db88a592fa08c50bd36b73002bdb8@linux.vnet.ibm.com>
Reviewed-by: Viktor Mihajlovski <a96a137ca8976b5ff3114c85be7aeb3b6464dad7@linux.vnet.ibm.com>

andreabolognani/libvirt,crobinso/libvirt,jfehlig/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,agx/libvirt,jardasgit/libvirt,shugaoye/libvirt,nertpinx/libvirt,elmarco/libvirt,cbosdo/libvirt,eskultety/libvirt,elmarco/libvirt,taget/libvirt,zippy2/libvirt,taget/libvirt,crobinso/libvirt,olafhering/libvirt,zippy2/libvirt,datto/libvirt,elmarco/libvirt,jardasgit/libvirt,cbosdo/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,VenkatDatta/libvirt,libvirt/libvirt,datto/libvirt,libvirt/libvirt,nertpinx/libvirt,taget/libvirt,agx/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,zippy2/libvirt,andreabolognani/libvirt,nertpinx/libvirt,shugaoye/libvirt,taget/libvirt,jfehlig/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,jfehlig/libvirt,andreabolognani/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,shugaoye/libvirt,libvirt/libvirt,cbosdo/libvirt,rlaager/libvirt,fabianfreyer/libvirt,agx/libvirt,crobinso/libvirt,crobinso/libvirt,zippy2/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,olafhering/libvirt,elmarco/libvirt,agx/libvirt,agx/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,shugaoye/libvirt,jfehlig/libvirt,eskultety/libvirt,eskultety/libvirt,VenkatDatta/libvirt,rlaager/libvirt,eskultety/libvirt,libvirt/libvirt,fabianfreyer/libvirt,datto/libvirt,eskultety/libvirt,elmarco/libvirt,olafhering/libvirt,datto/libvirt,fabianfreyer/libvirt,datto/libvirt,jardasgit/libvirt,jardasgit/libvirt,shugaoye/libvirt,rlaager/libvirt,rlaager/libvirt