Make the transport plugins use the twisted IPlugin interface

here we also make the setup.py install the twisted plugins

setup.py

@@ -50,7 +50,7 @@ def run(self):
     "platforms": ["any"],
 
     "package_dir": {"": "src"},
-    "packages": ["foolscap", "foolscap.slicers", "foolscap.logging",
+    "packages": ["twisted.plugins", "foolscap", "foolscap.slicers", "foolscap.logging",
                  "foolscap.appserver", "foolscap.test"],
     "entry_points": {"console_scripts": [
         "flogtool = foolscap.logging.cli:run_flogtool",

src/foolscap/connection_plugins.py

@@ -2,9 +2,11 @@
 import re
 from zope.interface import implementer
 from twisted.internet import endpoints
+from twisted.plugin import IPlugin
 
 from foolscap.ipb import IConnectionHintHandler, InvalidHintError
 
+
 try:
     import txsocksx
 except ImportError:
@@ -57,8 +59,8 @@ def convert_legacy_hint(location):
         return "tcp:%s:%d" % (host, port)
     return location
 
-@implementer(IConnectionHintHandler)
-class DefaultTCP:
+@implementer(IConnectionHintHandler, IPlugin)
+class DefaultTCP(object):
     def hint_to_endpoint(self, hint, reactor):
         # Return (endpoint, hostname), where "hostname" is what we pass to the
         # HTTP "Host:" header so a dumb HTTP server can be used to redirect us.
@@ -68,8 +70,8 @@ def hint_to_endpoint(self, hint, reactor):
         host, port = mo.group(1), int(mo.group(2))
         return endpoints.HostnameEndpoint(reactor, host, port), host
 
-@implementer(IConnectionHintHandler)
-class SOCKS5:
+@implementer(IConnectionHintHandler, IPlugin)
+class SOCKS5(object):
     def __init__(self, endpoint=None, proxy_endpoint_factory=None):
         if txsocksx is None:
             raise PluginDependencyNotLoaded("""SOCKS5 foolscap client transport plugin requires txsocksx.\n

src/twisted/plugins/load_transport_plugins.py

@@ -0,0 +1,3 @@
+import foolscap
+tcpTransportPlugin = foolscap.DefaultTCP()
+socksTransportPlugin = foolscap.SOCKS5()