errors: introduce a class for remote errors

Having an exception for remote errors makes it much easier to exit
with the right detailed exit code.

Differential Revision: https://phab.mercurial-scm.org/D10466

mercurial/error.py

@@ -304,7 +304,11 b' class ResponseExpected(Abort):'
         Abort.__init__(self, _(b'response expected'))
 
 
-class OutOfBandError(Abort):
+class RemoteError(Abort):
+    """Exception raised when interacting with a remote repo fails"""
+
+
+class OutOfBandError(RemoteError):
     """Exception raised when a remote repo reports failure"""
 
     def __init__(self, *messages, **kwargs):

mercurial/scmutil.py

@@ -222,7 +222,7 b' def callcatch(ui, func):'
             detailed_exit_code = 30
         elif isinstance(inst, error.HookAbort):
             detailed_exit_code = 40
-        elif isinstance(inst, error.OutOfBandError):
+        elif isinstance(inst, error.RemoteError):
             detailed_exit_code = 100
         elif isinstance(inst, error.SecurityError):
             detailed_exit_code = 150