Retry PG changes without re-running lpsolve when pool configuration and OSD tree don't change

OSDs often change their /pg/history keys during rebalance, so monitor receives additional
transaction failures from etcd if it re-runs lpsolve which sometimes may even lead to monitor
being unable to apply PG changes at all until rebalance completes

tests/test_vm_cont.sh

@@ -15,7 +15,7 @@ for i in $(seq 1 $OSD_COUNT); do
     eval OSD${i}_PID=$!
 done
 
-(while true; do node mon/mon-main.js --etcd_url $ETCD_URL --etcd_prefix "/vitastor" --verbose 1 || true; done) &>./testdata/mon.log &
+(while true; do node mon/mon-main.js --etcd_address $ETCD_URL --etcd_prefix "/vitastor" --verbose 1 || true; done) >>./testdata/mon.log 2>&1 &
 MON_PID=$!
 
 sleep 3