Async enter/open the symcache in paper engine

Since we don't want to be doing a `trio.run()` from async code (being
already in the `tractor` runtime and all); for now just put a top level
block wrapping async enter until we figure out to embed it (likely)
inside `open_account()` and pass the ref to `open_trade_ledger()`.

piker/clearing/_paper_engine.py

@@ -49,9 +49,10 @@ from ..accounting import (
     Transaction,
     TransactionLedger,
     open_trade_ledger,
-    open_pps,
+    open_account,
 )
 from ..data import iterticks
+from ..data._symcache import open_symcache
 from ..accounting import unpack_fqme
 from ._util import (
     log,  # sub-sys logger
@@ -541,10 +542,15 @@ async def open_trade_dialog(
     # enable piker.clearing console log for *this* subactor
     get_console_log(loglevel)
 
+    async with open_symcache(get_brokermod(broker)) as symcache:
         acnt: Account
         ledger: TransactionLedger
         with (
-        open_pps(
+
+            # TODO: probably do the symcache and ledger loading
+            # implicitly behind this? Deliver an account, and ledger
+            # pair or make the ledger an attr of the account?
+            open_account(
                 broker,
                 'paper',
                 write_on_exit=True,
@@ -553,6 +559,7 @@ async def open_trade_dialog(
             open_trade_ledger(
                 broker,
                 'paper',
+                symcache=symcache,
             ) as ledger
         ):
             # NOTE: retreive market(pair) info from the backend broker
@@ -647,7 +654,6 @@ async def open_trade_dialog(
                 # sanity check all the mkt infos
                 for fqme, flume in feed.flumes.items():
                     mkt = mkt_by_fqme[fqme]
-                print(mkt - flume.mkt)
                     assert  mkt == flume.mkt
 
                 async with (