Don't use universal_newlines=True in subprocess.Popen()
Don't use universal_newlines=True in subprocess.Popen()

For some versions of python this appears to cause corruption of the
output byte string by forcibly decoding with the wrong encoding.

Signed-off-by: Paul Durrant <dba6cd059c0054f8a3c62ba902cd9d7238853ee4@citrix.com>

omeg/xenbus,MarkKMueller/xenbus,omeg/xenbus,omeg/xenbus,MarkKMueller/xenbus,rneilturner/xenbus,rneilturner/xenbus,QubesOS/qubes-vmm-xen-win-pvdrivers-xenbus,MarkKMueller/xenbus,QubesOS/qubes-vmm-xen-win-pvdrivers-xenbus,QubesOS/qubes-vmm-xen-win-pvdrivers-xenbus,rneilturner/xenbus