noosfero | Cleans session when after captcha is answered (!1139)

[Gabriel Silva]

New Merge Request !1139

https://gitlab.com/noosfero/noosfero/merge_requests/1139

Project:Branches: gabrielssilva/noosfero:captcha_cache to noosfero/noosfero:master
Author:    Gabriel Silva
Assignee:  

If the captcha is displayed in the sign up page, it will keep being displayed event if the user answer it.

This patch cleans the `may_be_a_bot` session value after the captcha is verified, so it will disappear once we make sure the user is not a bot.

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