support multiple IPv4 addresses in redhat driver
    
    netcf has always supported multiple IPv6 addresses, but only a single
    IPv4 address. This patch remedies that, at least for the redhat driver
    (also used for Fedora and CentOS).
    
    I can't claim that the xsl transforms in redhat-(get|put).xsl are the
    optimum code, but they do get the job done (no mean feat, since this
    is the first time I've ever made anything beyond a cosmetic change to
    an xsl script).
    
    Similar to what NetworkManager does, the first IPv4 address is stored
    in the ifcfg file as
    
       IPADDR=b.l.a.h
       NETMASK=b.l.a.h
    
    while subsequent ip addresses are stored as:
    
       IPADDRn=b.l.a.h
       NETMASKn=b.l.a.h
    
    where "n" is 1 - 99 (since that is what initscripts (and probably
    NetworkManager) support).
    
    A new test case with multiple IPv4 addresses has also been added -
    bridge-multi.