Mark some dead code in RangeAllocator as dead
Mark some dead code in RangeAllocator as dead

Make it private first, in order to make it dead.
If we know, or at least believe, that the code is dead, then we are
justified in ignoring it, i.e, not worrying about bugs or API issues.

Later either it can be removed or it can be fixed.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratisd,trgill/stratisd,stratis-storage/stratisd,trgill/stratisd,stratis-storage/stratisd,mulkieran/stratisd,mulkieran/stratisd