Mega-merge 1: Test invoice creation with description hash (WIP) (#812)

* check for description hash

* remove unnecessary asserts for clarity

* assume that description_hash is a hash already

* no lock

* restore bolt11.py

* /api/v1/payments with hex of description

* comment

tests/conftest.py

@@ -122,12 +122,8 @@ async def adminkey_headers_to(to_wallet):
 
 @pytest_asyncio.fixture(scope="session")
 async def invoice(to_wallet):
-    wallet = to_wallet
     data = await get_random_invoice_data()
     invoiceData = CreateInvoiceData(**data)
-    stuff_lock = asyncio.Lock()
-    async with stuff_lock:
-        invoice = await api_payments_create_invoice(invoiceData, wallet)
-    await asyncio.sleep(1)
+    invoice = await api_payments_create_invoice(invoiceData, to_wallet)
     yield invoice
     del invoice