94_logstash: Enable logstash support
94_logstash: 1. Add instruction. 2. comment out logstash in config.py
94_logstash: actually we donot need import logstash in deuce, Pecan and Python logging have it
94_logstash: fix syntax in config.py
94_logstash: fix pep8 in config.py
Merge pull request #48 from raxyu/94_logstash

94 logstash
Merge remote-tracking branch 'repo/master' into 101_swift_drv_fixes
101_swift_drv_fixes: Update auth logic,

1. roll back auth hook
2. Add auth_url to config.py
3. remove storage_url from request header; don't access storage_url in any controller
4. add get_blocks_generator() to model vault, so files controller does not access storage_driver for it
5. don't require storage_url from storage driver interfaces.
6. 'x-auth-token' is demand in all requests' heads; x-user-name and x-password are not.
7. update swift_driver.txt