Rewrite Makefile, add obuild file

Signed-off-by: John Else <john.else@citrix.com>
Remove Fhs reference to config file

Signed-off-by: John Else <john.else@citrix.com>
Remove more references to Fhs

Signed-off-by: John Else <john.else@citrix.com>
Import some constants from xen-api

Signed-off-by: John Else <john.else@citrix.com>
Import a fistpoint from xen-api

Signed-off-by: John Else <john.else@citrix.com>
Use the standalone inventory package

Signed-off-by: John Else <john.else@citrix.com>