Binary tests pass against the previous xenstore version

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
xstest: flush stdout after printing to achieve a nice interleaving under 'strace'

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
test: check binary messages gathered by 'strace xstest'

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Remove extraneous logging