Evaluate client cert paths relative to config file

http2irc.py

@@ -96,6 +96,7 @@ class Config(dict):
 			if 'certfile' in obj['irc']:
 				if not isinstance(obj['irc']['certfile'], str):
 					raise InvalidConfig('Invalid certificate file: not a string')
+				obj['irc']['certfile'] = os.path.abspath(os.path.join(os.path.dirname(self._filename), obj['irc']['certfile']))
 				if not os.path.isfile(obj['irc']['certfile']):
 					raise InvalidConfig('Invalid certificate file: not a regular file')
 				if not is_valid_pem(obj['irc']['certfile'], True):
@@ -103,6 +104,7 @@ class Config(dict):
 			if 'certkeyfile' in obj['irc']:
 				if not isinstance(obj['irc']['certkeyfile'], str):
 					raise InvalidConfig('Invalid certificate key file: not a string')
+				obj['irc']['certkeyfile'] = os.path.abspath(os.path.join(os.path.dirname(self._filename), obj['irc']['certkeyfile']))
 				if not os.path.isfile(obj['irc']['certkeyfile']):
 					raise InvalidConfig('Invalid certificate key file: not a regular file')
 				if not is_valid_pem(obj['irc']['certkeyfile'], False):