Merge pull request #250 from euanh/master

pbuilder: Remove avsm OCaml repository
ocaml-xenops: Add ocaml-xcp-idl-devel build dependency

Signed-off-by: Euan Harris <euan.harris@citrix.com>
scripts: Add script to log into pbuilder chroot

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #251 from euanh/debian

scripts: Add a script to log into an interactive shell in the pbuilder c...