radix: improve address range handling

radix: improve address range handling

Handle non-exact address ranges from string. This can come directly
from user input, so here it is accepted but the address is converted
to the address range start. A warning will be issued.

Debug validation checks are added to catch this.

This issue could lead to bad input from iprep (with cidr), defrag config
and htp server personalities to produce a bad radix tree.

Bug: #5084.
Bug: #5085.
Bug: #5086.
(cherry picked from commit 7fd6fe732b360d4f1de4483b539af2eda813b966)