tools/python: Remove some legacy scripts

tools/python: Remove some legacy scripts

Nothing in scripts/ is referenced by the current Xen build system.  It is a
legacy version of the XenAPI bindings, other parts of which have already been
removed from the tree.

Additionally, prevent the install target from creating an $(SBINDIR) directory
but putting nothing in it.  This appears to be something missed when removing
Xend.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>