Re-work of thread model

ext/ZeroTierOne.patch

@@ -36,29 +36,3 @@ index 74c22d33..58979e26 100644
  			if (i < nqcb->oldQueues.size()) {
  				if (nqcb->oldQueues[i]->byteLength > maxQueueLength) {
  					maxQueueLength = nqcb->oldQueues[i]->byteLength;
-diff --git a/service/OneService.cpp b/service/OneService.cpp
-index a1c53764..e3034059 100644
---- a/service/OneService.cpp
-+++ b/service/OneService.cpp
-@@ -625,6 +625,8 @@ public:
- 						break;
- 					if (!pkt)
- 						break;
-+					if (!_run)
-+						break;
- 
- 					const ZT_ResultCode rc = _node->processWirePacket(nullptr,pkt->now,pkt->sock,&(pkt->from),pkt->data,pkt->size,&_nextBackgroundTaskDeadline);
- 					{
-@@ -2244,6 +2246,12 @@ public:
- #endif
- 					syncManagedStuff(n,true,true);
- 					n.tap->setMtu(nwc->mtu);
-+#if defined(ZT_SDK)
-+					// Inform the virtual tap of the update
-+					if (op == ZT_VIRTUAL_NETWORK_CONFIG_OPERATION_CONFIG_UPDATE) {
-+						n.tap->lastConfigUpdate(OSUtils::now());
-+					}
-+#endif
- 				} else {
- 					_nets.erase(nwid);
- 					return -999; // tap init failed