fix(SwingSet): increase default snapshotInitial from 2 to 3

The new `initialize-worker` pseudo-delivery counts against our
`snapshotInitial` threshold. So the old threshold of "2" (allowing two
real deliveries to the vat before we make the first snapshot, one for
`startVat`, and another for the usual `startZcf` that our contract
vats do) needs to become "3".

This updates test-state.js to match.

A few tests provide a specific value (usually "2"), and are sensitive
to the exact sequence of deliveries being made (including
`save-snapshot` pseudo-deliveries). These were left alone.

closes #7548

packages/SwingSet/src/kernel/state/kernelKeeper.js

@@ -298,7 +298,7 @@ export default function makeKernelKeeper(kernelStorage, kernelSlog) {
       defaultManagerType = 'local',
       defaultReapInterval = 1,
       relaxDurabilityRules = false,
-      snapshotInitial = 2,
+      snapshotInitial = 3,
       snapshotInterval = 200,
     } = kernelOptions;
 

packages/SwingSet/test/snapshots/test-state.js.md

@@ -8,8 +8,8 @@ Generated by [AVA](https://avajs.dev).
 
 > initial state
 
-    'cd49a1acb9a4a29e2e11db5b1f20583dec0c8e2f42c59ecfeb1210e9a5af2e95'
+    'a5d302e6743578ccda03ea386abd49de0a3bf4d7dedda2f69585c663806c30bc'
 
 > expected activityhash
 
-    '63ca45dd5fd430a01013f8ce504f8dcfd29f5c63c861d98b10bf002ecc6dc93c'
+    'f5f1f643f6242a73c79b0437dbab222d34642ea5d047f15aaf5551d5903711d3'

packages/SwingSet/test/test-state.js

@@ -197,7 +197,7 @@ test('kernel state', async t => {
     ['kp.nextID', '40'],
     ['kernel.defaultManagerType', 'local'],
     ['kernel.defaultReapInterval', '1'],
-    ['kernel.snapshotInitial', '2'],
+    ['kernel.snapshotInitial', '3'],
     ['kernel.snapshotInterval', '200'],
     ['meter.nextID', '1'],
   ]);
@@ -233,7 +233,7 @@ test('kernelKeeper vat names', async t => {
     ['vat.name.Frank', 'v2'],
     ['kernel.defaultManagerType', 'local'],
     ['kernel.defaultReapInterval', '1'],
-    ['kernel.snapshotInitial', '2'],
+    ['kernel.snapshotInitial', '3'],
     ['kernel.snapshotInterval', '200'],
     ['meter.nextID', '1'],
   ]);
@@ -283,7 +283,7 @@ test('kernelKeeper device names', async t => {
     ['device.name.Frank', 'd8'],
     ['kernel.defaultManagerType', 'local'],
     ['kernel.defaultReapInterval', '1'],
-    ['kernel.snapshotInitial', '2'],
+    ['kernel.snapshotInitial', '3'],
     ['kernel.snapshotInterval', '200'],
     ['meter.nextID', '1'],
   ]);
@@ -465,7 +465,7 @@ test('kernelKeeper promises', async t => {
     [`${ko}.refCount`, '1,1'],
     ['kernel.defaultManagerType', 'local'],
     ['kernel.defaultReapInterval', '1'],
-    ['kernel.snapshotInitial', '2'],
+    ['kernel.snapshotInitial', '3'],
     ['kernel.snapshotInterval', '200'],
     ['meter.nextID', '1'],
   ]);