When user creates a bay without passing node-count, the default node-count
is 1 which means one bay-master and one bay-node is created.
But the bay-list shows node-count as 'None' which is wrong.
So this patch sets default node_count to 1.
Change-Id: I91a1903cec38fdae08a75d5b364640dab41a9e72
Closes-bug: #1465097