tests: reorganize packages (#7)

* tests: reorganize testing packages

* gitignore and minor changes

Makefile

@@ -267,9 +267,9 @@ test-race:
 	@go test -v --vet=off -race ./... $(PACKAGES)
 
 test-import:
-	@go test ./importer -v --vet=off --run=TestImportBlocks --datadir tmp \
+	@go test ./tests/importer -v --vet=off --run=TestImportBlocks --datadir tmp \
 	--blockchain blockchain
-	rm -rf importer/tmp
+	rm -rf tests/importer/tmp
 
 test-rpc:
 	./scripts/integration-test-all.sh -t "rpc" -q 1 -z 1 -s 2 -m "rpc" -r "true"