remotefilelog: byteify the message for a few StorageErrors

Flagged by pytype locally.

hgext/remotefilelog/shallowutil.py

@@ -247,7 +247,7 b' def parsesizeflags(raw):'
         index = raw.index(b'\0')
     except ValueError:
         raise BadRemotefilelogHeader(
-            "unexpected remotefilelog header: illegal format"
+            b"unexpected remotefilelog header: illegal format"
         )
     header = raw[:index]
     if header.startswith(b'v'):
@@ -267,7 +267,7 b' def parsesizeflags(raw):'
         size = int(header)
     if size is None:
         raise BadRemotefilelogHeader(
-            "unexpected remotefilelog header: no size found"
+            b"unexpected remotefilelog header: no size found"
         )
     return index + 1, size, flags
 

tests/test-remotefilelog-corrupt-cache.t

@@ -38,7 +38,7 b' Verify corrupt cache error message'
   $ chmod u+w $CACHEDIR/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/1406e74118627694268417491f018a4a883152f0
   $ echo x > $CACHEDIR/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/1406e74118627694268417491f018a4a883152f0
   $ hg up tip 2>&1 | egrep "^[^ ].*unexpected remotefilelog"
-  hgext.remotefilelog.shallowutil.BadRemotefilelogHeader: unexpected remotefilelog header: illegal format (py3 !)
+  abort: unexpected remotefilelog header: illegal format
 
 Verify detection and remediation when remotefilelog.validatecachelog is set