[FAB-4312] Remove unused peer.workers config

Remove the unused peer.workers config item from
examples/cluster/config/core.yaml.

Change-Id: I505eb96041452284fd61888a922fe43f8f82539e
Signed-off-by: Baohua Yang <baohyang@cn.ibm.com>

Author: yeasy

examples/cluster/config/core.yaml

@@ -85,7 +85,6 @@ peer:
 
     # Setting for runtime.GOMAXPROCS(n). If n < 1, it does not change the current setting
     gomaxprocs: -1
-    workers: 2
 
     # Gossip related configuration
     gossip: