Added bootstrap tests

This involved adding a feature to the test suite in include the option of using a repository located on disk rather than in memory. Also moved the bootstrap compression/extraction working directories to temporary folders.

src/test/resources/test-settings-v2-reward-scaling.json

@@ -1,9 +1,11 @@
 {
+  "repositoryPath": "testdb",
   "restrictedApi": false,
   "blockchainConfig": "src/test/resources/test-chain-v2-reward-scaling.json",
   "exportPath": "qortal-backup-test",
   "bootstrap": false,
   "wipeUnconfirmedOnStart": false,
   "testNtpOffset": 0,
-  "minPeers": 0
+  "minPeers": 0,
+  "pruneBlockLimit": 100
 }