tests: add b'' to notcapable

This fixes some exceptions in a few tests.

# skip-blame just b'' prefixes

Differential Revision: https://phab.mercurial-scm.org/D5646

tests/notcapable

@@ -1,24 +1,24
 # Disable the $CAP wire protocol capability.
 
 if test -z "$CAP"
 then
     echo "CAP environment variable not set."
 fi
 
 cat > notcapable-$CAP.py << EOF
 from mercurial import extensions, localrepo, repository
 def extsetup(ui):
     extensions.wrapfunction(repository.peer, 'capable', wrapcapable)
     extensions.wrapfunction(localrepo.localrepository, 'peer', wrappeer)
 def wrapcapable(orig, self, name, *args, **kwargs):
-    if name in '$CAP'.split(' '):
+    if name in b'$CAP'.split(b' '):
         return False
     return orig(self, name, *args, **kwargs)
 def wrappeer(orig, self):
     # Since we're disabling some newer features, we need to make sure local
     # repos add in the legacy features again.
     return localrepo.locallegacypeer(self)
 EOF
 
 echo '[extensions]' >> $HGRCPATH
 echo "notcapable-$CAP = `pwd`/notcapable-$CAP.py" >> $HGRCPATH