ONOS-737: regexp for grabbing OC* variables changed

Change-Id: Id5651ffb41230a39c6ed68e1605feaf3c0aa337b
diff --git a/tools/test/bin/onos-remove-raft-logs b/tools/test/bin/onos-remove-raft-logs
index 1f1e5c6..3a44963 100755
--- a/tools/test/bin/onos-remove-raft-logs
+++ b/tools/test/bin/onos-remove-raft-logs
@@ -6,7 +6,7 @@
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
 . $ONOS_ROOT/tools/build/envDefaults
 
-nodes=$(env | sort | egrep "OC[0-9]+" | cut -d= -f2)
+nodes=$(env | sort | egrep "^OC[0-9]+" | cut -d= -f2)
 
 onos-service --cell stop