Tweak mempool code

Precede 2 private functions with _.  Removed unused arg.

server/mempool.py

@@ -49,7 +49,7 @@ class MemPool(util.LoggedClass):
         initial mempool sync.'''
         self.prioritized.add(tx_hash)
 
-    def resync_daemon_hashes(self, unprocessed, unfetched):
+    def _resync_daemon_hashes(self, unprocessed, unfetched):
         '''Re-sync self.txs with the list of hashes in the daemon's mempool.
 
         Additionally, remove gone hashes from unprocessed and
@@ -90,7 +90,7 @@ class MemPool(util.LoggedClass):
         unfetched = set()
         txs = self.txs
         fetch_size = 800
-        process_some = self.async_process_some(unfetched, fetch_size // 2)
+        process_some = self._async_process_some(fetch_size // 2)
 
         await self.daemon.mempool_refresh_event.wait()
         self.logger.info('beginning processing of daemon mempool.  '
@@ -122,7 +122,7 @@ class MemPool(util.LoggedClass):
                     self.prioritized.clear()
                     await self.daemon.mempool_refresh_event.wait()
 
-                self.resync_daemon_hashes(unprocessed, unfetched)
+                self._resync_daemon_hashes(unprocessed, unfetched)
                 self.daemon.mempool_refresh_event.clear()
 
                 if unfetched:
@@ -139,7 +139,7 @@ class MemPool(util.LoggedClass):
                 self.stop = True
                 break
 
-    def async_process_some(self, unfetched, limit):
+    def _async_process_some(self, limit):
         pending = []
         txs = self.txs