xl/remus: cmdline switches and config vars to control network buffering

xl/remus: cmdline switches and config vars to control network buffering

Add two members in libxl_domain_remus_info:
    netbuf: whether netbuf is enabled
    netbufscript: the path of the script which will be run to setup
                  and tear down the guest's interface.

Add cmdline switches to 'xl remus' command to enable or disable
network buffering and a domain-specific hotplug script to setup
network buffering.

Add a new config var 'remus.default.netbufscript' to xl.conf, that
allows the user to override the default global script used to
setup network buffering.

Note: Network buffering is enabled by default. Disabling network
buffering requires enabling unsafe mode.

Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Reviewed-by: Wen Congyang <wency@cn.fujitsu.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>