Fix for core dump in Pynfs run when ganesha is started in debug mode.

The sequence id is written into a string str, whose size is 31 bytes.The
values of stateid->seqid varies from 1,2 to the largest number possible,
4294967295. The size of the string str has to be 36 bytes long (along with the ':')
to accommodate the largest possible stateid->seqid. Increasing the string size to fix the issue.