[sql lab] fix encoding error in logging message

[graceguo-supercat]

In Sql Lab, user types in a query with unicode like this:

SELECT * FROM "tb_name" WHERE city = "Lübeck"

When sql_parse.py and sql_lab.py tried to log message like:
logging.info("Parsing with sqlparse statement {}".format(self.sql))
This cause exception thrown, and user got Internal Server Error from Sql Lab.

[coveralls]

Coverage decreased (-0.2%) to 68.9% when pulling 7ad234ab6e2717db82ed30dc32676af8a7534d53 on graceguo-supercat:gg-SQLlabEncoding into 3dfdde1 on apache:master.

[coveralls]

Coverage decreased (-0.2%) to 68.9% when pulling 7ad234ab6e2717db82ed30dc32676af8a7534d53 on graceguo-supercat:gg-SQLlabEncoding into 3dfdde1 on apache:master.

[coveralls]

Coverage decreased (-0.2%) to 68.961% when pulling d8a769fc3dec5e74624ae62a5da266dbcba1b247 on graceguo-supercat:gg-SQLlabEncoding into 3dfdde1 on apache:master.

[coveralls]

Coverage decreased (-0.2%) to 68.961% when pulling b27b5bf70dbfbaa2ad0fe919abca2f3a88172ce5 on graceguo-supercat:gg-SQLlabEncoding into 3dfdde1 on apache:master.

[coveralls]

Coverage decreased (-0.2%) to 68.961% when pulling b27b5bf70dbfbaa2ad0fe919abca2f3a88172ce5 on graceguo-supercat:gg-SQLlabEncoding into 3dfdde1 on apache:master.

[coveralls]

Coverage increased (+0.005%) to 69.123% when pulling 786b12ff28c1bf40312f430d907cb856619d3ae3 on graceguo-supercat:gg-SQLlabEncoding into 3dfdde1 on apache:master.

[mistercrunch]

>>> dedup(['foo', 'bar', 'bar', 'bar']) to

>>> len(dedup(['foo', 'bar', 'bar', 'bar']))
4

[coveralls]

Coverage decreased (-0.2%) to 68.962% when pulling b8b5ea9122a7c186dc3ce54a545097e180e3a00f on graceguo-supercat:gg-SQLlabEncoding into 8223729 on apache:master.

[coveralls]

Coverage increased (+0.009%) to 69.129% when pulling eeb6b86 on graceguo-supercat:gg-SQLlabEncoding into 8223729 on apache:master.

[coveralls]

Coverage increased (+0.009%) to 69.129% when pulling eeb6b86 on graceguo-supercat:gg-SQLlabEncoding into 8223729 on apache:master.