rman updates/cleanup

[ehem]

Upon examination it turned out rman_reserve_resource_bound() was completely unused. This is distinctly troublesome since it serves to misdirect people who were instead looking for RF_ALIGNMENT_LOG2(). As such nuke rman_reserve_resource_bound() and fold everything back into rman_reserve_resource().

Also spot rman_make_alignment_flags() was rather out date and really needed an update.