Specify 'remote_autostart' for macOS to consolidate session initializ…

…ation with Linux.

When XDEBUG_CONFIG environment variable is defined Xdebug will automatically start a session, despite 'XDEBUG_SESSION_START' being specified or not.
On Linux both 'remote_host' and 'remote_log' are specified in XDEBUG_CONFIG whereas macOS just has INI configuration which resulted in different methods for initiating a debugging session.

.travis.yml

@@ -82,6 +82,7 @@ jobs:
         - |
           XDEBUG_INI_FILE=/usr/local/etc/php/${PHP_VERSION}/conf.d/ext-xdebug.ini
           echo "xdebug.remote_enable=1" >> $XDEBUG_INI_FILE
+          echo "xdebug.remote_autostart=1" >> $XDEBUG_INI_FILE
           echo "xdebug.remote_host=127.0.0.1" >> $XDEBUG_INI_FILE
           echo "xdebug.remote_port=9000" >> $XDEBUG_INI_FILE
           echo "xdebug.remote_handler=dbgp" >> $XDEBUG_INI_FILE

xdebug/unittesting.py

@@ -140,7 +140,7 @@ def get_xdebug_setting(self, key):
     def run_command(self, *args, **kwargs):
         sublime.active_window().run_command(*args, **kwargs)
 
-    def send_server_request(self, path='', params='XDEBUG_SESSION_START=1'):
+    def send_server_request(self, path='', params=''):
         if isinstance(params, dict):
             params = urlencode(params)
         query_string = '?' + params if len(params) else ''