disallowed when reloading some/most PRI options (such as signalling) was disallowed.
Options such as polarityonanswerdelay and answeronpolarityswitch can safely be changed on a reload.
This corrects that behavior.
Issue 9186, patch by tzafrir.
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@74158 65c4cc65-6c06-0410-ace0-fbb531ad65f3