Rename rrdd to rrd everywhere

Signed-off-by: John Else <john.else@citrix.com>
Add rrdd interface to build

Signed-off-by: John Else <john.else@citrix.com>
camlp4-ify the rrdd code

Signed-off-by: John Else <john.else@citrix.com>
Update OASIS - it builds!

Signed-off-by: John Else <john.else@citrix.com>
Use some of the XCP utils in the RRD interface and client

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