py3: fix EOL detection in commandserver.channeledinput

This breaks TortoiseHg's email preview which sends b'\n' while readline
request is issued and the loop never ends. Spotted by Matt Harbison.

mercurial/commandserver.py

@@ -160,7 +160,7 b' class channeledinput(object):'
             buf = s
             # keep asking for more until there's either no more or
             # we got a full line
-            while s and s[-1] != b'\n':
+            while s and not s.endswith(b'\n'):
                 s = self._read(size, b'L')
                 buf += s
 

tests/test-commandserver.t

@@ -654,6 +654,9 b' changelog and manifest would have invali'
   ...     runcommand(server, [b'debugprompt', b'--config',
   ...                         b'ui.interactive=True'],
   ...                input=stringio(b'5678\n'))
+  ...     runcommand(server, [b'debugprompt', b'--config',
+  ...                         b'ui.interactive=True'],
+  ...                input=stringio(b'\nremainder\nshould\nnot\nbe\nread\n'))
   ...     runcommand(server, [b'debugreadstdin'])
   ...     runcommand(server, [b'debugwritestdout'])
   *** runcommand debuggetpass --config ui.interactive=True
@@ -665,6 +668,8 b' changelog and manifest would have invali'
    [255]
   *** runcommand debugprompt --config ui.interactive=True
   prompt: 5678
+  *** runcommand debugprompt --config ui.interactive=True
+  prompt: y
   *** runcommand debugreadstdin
   read: ''
   *** runcommand debugwritestdout