py3: add missing b prefixes in test-debugextensions.t

# skip-blame just some b prefixes

Differential Revision: https://phab.mercurial-scm.org/D2543

tests/test-debugextensions.t

@@ -1,101 +1,101 b''
   $ hg debugextensions
 
   $ debugpath=`pwd`/extwithoutinfos.py
 
   $ cat > extwithoutinfos.py <<EOF
   > EOF
   $ cat > extwithinfos.py <<EOF
-  > testedwith = '3.0 3.1 3.2.1'
-  > buglink = 'https://example.org/bts'
+  > testedwith = b'3.0 3.1 3.2.1'
+  > buglink = b'https://example.org/bts'
   > EOF
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > histedit=
   > patchbomb=
   > rebase=
   > mq=
   > ext1 = $debugpath
   > ext2 = `pwd`/extwithinfos.py
   > EOF
 
   $ hg debugextensions
   ext1 (untested!)
   ext2 (3.2.1!)
   histedit
   mq
   patchbomb
   rebase
 
   $ hg debugextensions -v
   ext1
     location: */extwithoutinfos.py* (glob)
     bundled: no
   ext2
     location: */extwithinfos.py* (glob)
     bundled: no
     tested with: 3.0 3.1 3.2.1
     bug reporting: https://example.org/bts
   histedit
     location: */hgext/histedit.py* (glob)
     bundled: yes
   mq
     location: */hgext/mq.py* (glob)
     bundled: yes
   patchbomb
     location: */hgext/patchbomb.py* (glob)
     bundled: yes
   rebase
     location: */hgext/rebase.py* (glob)
     bundled: yes
 
   $ hg debugextensions -Tjson | sed 's|\\\\|/|g'
   [
    {
     "buglink": "",
     "bundled": false,
     "name": "ext1",
     "source": "*/extwithoutinfos.py*", (glob)
     "testedwith": []
    },
    {
     "buglink": "https://example.org/bts",
     "bundled": false,
     "name": "ext2",
     "source": "*/extwithinfos.py*", (glob)
     "testedwith": ["3.0", "3.1", "3.2.1"]
    },
    {
     "buglink": "",
     "bundled": true,
     "name": "histedit",
     "source": "*/hgext/histedit.py*", (glob)
     "testedwith": []
    },
    {
     "buglink": "",
     "bundled": true,
     "name": "mq",
     "source": "*/hgext/mq.py*", (glob)
     "testedwith": []
    },
    {
     "buglink": "",
     "bundled": true,
     "name": "patchbomb",
     "source": "*/hgext/patchbomb.py*", (glob)
     "testedwith": []
    },
    {
     "buglink": "",
     "bundled": true,
     "name": "rebase",
     "source": "*/hgext/rebase.py*", (glob)
     "testedwith": []
    }
   ]
 
   $ hg debugextensions -T '{ifcontains("3.1", testedwith, "{name}\n")}'
   ext2
   $ hg debugextensions \
   > -T '{ifcontains("3.2", testedwith, "no substring match: {name}\n")}'