talloc: talloc_may_reference

talloc: talloc_may_reference

A new flag allows us to mark objects which will/may be referenced in
future.  You shouldn't try to treat these as a non-reference-counted
object, even if it's currently only got one reference.

This makes us clean up the hardcoded constants for flag bits, and also
bump the minor number since we've changed talloc flags.

Signed-off-byL Rusty Russell <rusty@rustcorp.com.au>