Use the rpm macro for configure, fix sysconfdir

* Use %configure instead of ./configure, which pre-populates prefix,
libdir, bindir, etc to Red Hat defaults
* Override sysconfdir to be %{_sysconfdir}/sysconfig so everything
looks in /etc/sysconfig/openafs/ for configuration files.
cacheinfo: Update file to use /var/cache/openafs instead of /usr/vice/cache
openafs.spec: Use /etc/openafs for configuration files

Previous commits uses a directory /etc/sysconfig/openafs instead of
/etc/openafs, which is in line with how Debian packages are built.  In
an attempt to keep things similar to debian, use /etc/openafs/ for
client configuration, and /etc/openafs/server/ for server
configuration.

Compatibility links are updated to reflect this change.
Merge pull request #2 from jsbillings/master

Use configuration macros for building software, update cacheinfo