cellconfig: Do not use 'long' for dbserver IPs

A few places in this file assume that our dbserver IP addresses are
"long"s. A long int can be 8 bytes on some platforms, but we know
these IP addresses are all 4-byte integers. In the rare instances
where we have the maximum number of dbservers, this can overwrite a
bit of extra memory. This can also result in a misaligned access on
platforms such as SPARC v9, since the elements of he->h_addr_list are
not guaranteed to be 8-byte aligned.

So instead, treat these as 4-byte integers. For copying out of
he->h_addr_list, also use a memcpy anyway to be safe, since we are not
guaranteed alignment.

Reviewed-on: http://gerrit.openafs.org/10599
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit d8f75d3206eaa56b3a819a5bc13a4bf3a9130512)

Change-Id: I2568577b05f47ebc75b34a9cd106fceac8a31ef7
Reviewed-on: http://gerrit.openafs.org/10603
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>