For debug builds, add the ability to view memory registrations and deregistrations in the openib BTL.
In the case that HAVE_IBV_FORK_INIT is not defined, we will need this variable so we can give the user an error if they ask for it.  Also fixes compile error when HAVE_IBV_FORK_INIT is not defined.
Attempt to resolve the nightly build problem

Refs #3763