threading.Thread: fix some DeprecationWarnings

"DeprecationWarning: setDaemon() is deprecated, set the daemon attribute instead"

electrum/contacts.py

@@ -103,7 +103,7 @@ class Contacts(dict, Logger):
                 self.alias_info = self.resolve_openalias(alias)
                 trigger_callback('alias_received')
             t = threading.Thread(target=f)
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
 
     def resolve_openalias(self, url):

electrum/plugins/keepkey/keepkey.py

@@ -222,7 +222,7 @@ class KeepKeyPlugin(HW_PluginBase):
             import threading
             settings = self.request_trezor_init_settings(wizard, method, self.device)
             t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             exit_code = wizard.loop.exec_()
             if exit_code != 0:

electrum/plugins/safe_t/safe_t.py

@@ -180,7 +180,7 @@ class SafeTPlugin(HW_PluginBase):
             import threading
             settings = self.request_safe_t_init_settings(wizard, method, self.device)
             t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             exit_code = wizard.loop.exec_()
             if exit_code != 0:

electrum/plugins/trezor/trezor.py

@@ -222,7 +222,7 @@ class TrezorPlugin(HW_PluginBase):
             import threading
             settings = self.request_trezor_init_settings(wizard, method, device_id)
             t = threading.Thread(target=self._initialize_device_safe, args=(settings, method, device_id, wizard, handler))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             exit_code = wizard.loop.exec_()
             if exit_code != 0:

electrum/plugins/trustedcoin/qt.py

@@ -278,7 +278,7 @@ class Plugin(TrustedCoinPlugin):
         tos_e.tos_signal.connect(on_result)
         tos_e.error_signal.connect(on_error)
         t = threading.Thread(target=request_TOS)
-        t.setDaemon(True)
+        t.daemon = True
         t.start()
         email_e.textChanged.connect(set_enabled)
         email_e.setFocus(True)

electrum/plugins/trustedcoin/trustedcoin.py

@@ -523,7 +523,7 @@ class TrustedCoinPlugin(BasePlugin):
         if self.requesting is False:
             self.requesting = True
             t = Thread(target=self.request_billing_info, args=(wallet,))
-            t.setDaemon(True)
+            t.daemon = True
             t.start()
             return t