Add support for '*' in place of server name in RPL_WHOREPLY/RPL_WHOSPCRPL (#252)

Sable users are no longer associated with a server, so it now returns
a blank where their server name used to be:
Libera-Chat/sable@93ab9af

Author: progval

irctest/server_tests/who.py

@@ -60,7 +60,7 @@ def _checkReply(self, reply, flags):
                     "*",  # no chan
                     StrRe("~?" + self.username),
                     StrRe(host_re),
-                    "My.Little.Server",
+                    StrRe(r"(My.Little.Server|\*)"),
                     "coolNick",
                     flags,
                     StrRe(realname_regexp(self.realname)),
@@ -76,7 +76,7 @@ def _checkReply(self, reply, flags):
                     "#chan",
                     StrRe("~?" + self.username),
                     StrRe(host_re),
-                    "My.Little.Server",
+                    StrRe(r"(My.Little.Server|\*)"),
                     "coolNick",
                     flags + "@",
                     StrRe(realname_regexp(self.realname)),
@@ -336,7 +336,7 @@ def testWhoChan(self, mask):
                 "#chan",
                 StrRe("~?" + self.username),
                 StrRe(host_re),
-                "My.Little.Server",
+                StrRe(r"(My.Little.Server|\*)"),
                 "coolNick",
                 "G@",
                 StrRe(realname_regexp(self.realname)),
@@ -351,7 +351,7 @@ def testWhoChan(self, mask):
                 "#chan",
                 ANYSTR,
                 ANYSTR,
-                "My.Little.Server",
+                StrRe(r"(My.Little.Server|\*)"),
                 "otherNick",
                 "H",
                 StrRe("[0-9]+ .*"),
@@ -398,7 +398,7 @@ def testWhoMultiChan(self):
                     chan,
                     ANYSTR,
                     ANYSTR,
-                    "My.Little.Server",
+                    StrRe(r"(My.Little.Server|\*)"),
                     "coolNick",
                     ANYSTR,
                     ANYSTR,
@@ -413,7 +413,7 @@ def testWhoMultiChan(self):
                     chan,
                     ANYSTR,
                     ANYSTR,
-                    "My.Little.Server",
+                    StrRe(r"(My.Little.Server|\*)"),
                     "otherNick",
                     ANYSTR,
                     ANYSTR,
@@ -479,7 +479,7 @@ def _testWhoxFull(self, chars):
                 StrRe("~?myusernam"),
                 ANYSTR,
                 ANYSTR,
-                "My.Little.Server",
+                StrRe(r"(My.Little.Server|\*)"),
                 "coolNick",
                 StrRe("H@?"),
                 ANYSTR,  # hopcount