Replace print with log at different levels, and add the option to mask AWS credentials

[yaojiach]

Replaced print with logging. User can set the logging level. Default setting ('info' level), will keep the current behavior.
Added feature for users to decide if they want to mask/show AWS credentials when related information is printed. New default behavior is that credentials will be masked.

Examples

pr.set_log_level('info')

This will print everything but AWS credentials will be masked:

copy "table"
from 's3'
delimiter ','
ignoreheader 1
csv quote as '"'
dateformat 'auto'
timeformat 'auto'
access_key_id '********'
secret_access_key '********'    
;

---

pr.set_log_level('info', mask_secrets=False)

Same as current behavior, AWS credentials will be printed as is.

copy "table"
from 's3'
delimiter ','
ignoreheader 1
csv quote as '"'
dateformat 'auto'
timeformat 'auto'
access_key_id 'AWS_KEY'
secret_access_key 'AWS_SECRET'    
;

---

pr.set_log_level('error')

This will only log errors when they occur.

[agawronski]

Thanks man!

[agawronski]

Version 2.0.4 is up on PyPi, thanks again dude.