network/omaha: indent encoded xml responses from handler
network/omaha: indent encoded xml responses from handler

quantum/coreos-mantle,quantum/coreos-mantle,dm0-/mantle,marineam/mantle,glevand/coreos--mantle,marineam/mantle,mjg59/mantle,glevand/coreos--mantle,dm0-/mantle,mjg59/mantle