Patch from Scott McKellar for declaration cleanup and improved error handling:

Patch from Scott McKellar for declaration cleanup and improved error handling:

1. I added the const qualifier to several function parameters.

2. I replaced inet_addr() with inet_aton().

According to the man page, inet_addr() is obsolete.  It reports an
error by returning -1, which however is a valid IP address
(255.255.255.255).  inet_aton reports errors in a more robust way.

3. I check the return value from inet_aton().  If the input address is
invalid, I log a message and return -1.

Without such a check, an invalid listener address leads to a server
that is completely unresponsive.  The user has no way to know what's
wrong unless he spots the mistake himself in the relevant
configuration file.

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1013 9efc2488-bf62-4759-914b-345cdb29e865