Fix opam remove for xen-api-libs-transitional

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
Sort remove list; replace xenstoreext w/ xenstore-compat

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
Merge pull request #3 from mcclurmc/xen-api-libs-transition-remove

Fix opam remove for xen-api-libs-transitional