fix issue for ConfigParser.NoOptionError: No option 'urlfilter' in section: 'pac'
fix issue for ConfigParser.NoOptionError: No option 'urlfilter' in section: 'pac'

http://code.google.com/p/goagent/issues/detail?id=10319
https://github.com/goagent/goagent/commit/06a8fb55329a2ee229694037c060e9
cdf10d970c

kang000feng/GoAgentX,mbbill/GoAgentX,feeloc/GoAgentX,kang000feng/GoAgentX,leichunxin/GoAgentX,mbbill/GoAgentX,treejames/GoAgentX-1,ubuntuvim/GoAgentX-1,jinphen/GoAgentX-1,m1a0yu3/GoAgentX,leichunxin/GoAgentX,feeloc/GoAgentX,feeloc/GoAgentX,m1a0yu3/GoAgentX,jinphen/GoAgentX-1,treejames/GoAgentX-1,treejames/GoAgentX-1,jinphen/GoAgentX-1,leichunxin/GoAgentX,jinphen/GoAgentX-1,mbbill/GoAgentX,ubuntuvim/GoAgentX-1,m1a0yu3/GoAgentX,m1a0yu3/GoAgentX,kang000feng/GoAgentX,kang000feng/GoAgentX,ubuntuvim/GoAgentX-1,leichunxin/GoAgentX,mbbill/GoAgentX,feeloc/GoAgentX,treejames/GoAgentX-1,ubuntuvim/GoAgentX-1