tipc: add link monitor summary

tipc: add link monitor summary

The monitor summary command prints the basic attributes
specific to the local node.
A sample usage is shown below:
$ tipc link monitor summary
bearer eth:data0
    table_generation 15
    cluster_size 8
    algorithm overlapping-ring

bearer eth:data1
    table_generation 15
    cluster_size 8
    algorithm overlapping-ring

$ tipc link monitor summary -h
Usage: tipc monitor summary

Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Tested-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>