rdma: Fix SRQ resource tracking information json

rdma: Fix SRQ resource tracking information json

Fix the json output for the QPs that are associated with the SRQ -
The qpn are now displayed in a json array.

Sample output before the fix:
$ rdma res show srq lqpn 126-141 -j -p
[ {
        "ifindex":0,
	"ifname":"ibp8s0f0",
	"srqn":4,
	"type":"BASIC",
	"lqpn":["126-128,130-140"],
	"pdn":9,
	"pid":3581,
	"comm":"ibv_srq_pingpon"
    },{
	"ifindex":0,
	"ifname":"ibp8s0f0",
	"srqn":5,
	"type":"BASIC",
	"lqpn":["141"],
	"pdn":10,
	"pid":3584,
	"comm":"ibv_srq_pingpon"
    } ]

Sample output after the fix:
$ rdma res show srq lqpn 126-141 -j -p
[ {
        "ifindex":0,
	"ifname":"ibp8s0f0",
	"srqn":4,
	"type":"BASIC",
	"lqpn":["126-128","130-140"],
	"pdn":9,
	"pid":3581,
	"comm":"ibv_srq_pingpon"
    },{
	"ifindex":0,
	"ifname":"ibp8s0f0",
	"srqn":5,
	"type":"BASIC",
	"lqpn":["141"],
	"pdn":10,
	"pid":3584,
	"comm":"ibv_srq_pingpon"
    } ]

Fixes: 9b272e138d23 ("rdma: Add SRQ resource tracking information")
Signed-off-by: Neta Ostrovsky <netao@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>