[tclwebtest] Change log to public api

[Grzegorz A. H. <gr...@ef...>]

Hi.

I've found out that log is a nice command to use along with assert,
since assert is silent when it succeeds, it may be good to move it
to the public api.

-- 
 Grzegorz Adam Hankiewicz, gr...@ef.... Tel: +34-94-472 35 89.
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