Add support to set/get a LUN's ALUA group
Add support to set/get a LUN's ALUA group

Set/get the LUN's ALUA group by setting/getting the alua_tg_pt_gp_name
value.

Signed-off-by: Mike Christie <39daeb1549a929782e38aa87c4e3da7f3844b09a@redhat.com>

cvubrugier/targetcli-fb,agrover/targetcli-fb