[#718] add exception class for SYS_SOCK_READ_TIMEDOUT

Author: d-w-moore

irods/exception.py

@@ -657,6 +657,10 @@ class SYS_RESC_QUOTA_EXCEEDED(SystemException):
     code = -110000
 
 
+class SYS_SOCK_READ_TIMEDOUT(SystemException):
+    code = -115000
+
+
 class SYS_INVALID_INPUT_PARAM(SystemException):
     code = -130000