confuse: write to files without leaving spaces around equal sign.

This allows simplest confuse files to be sourced from bash and
other shells, since they expect the format to be VARIABLE=VALUE
without any spaces.

Signed-off-by: Alvaro G. M. <alvaro.gamez@hazent.com>
Merge pull request #7 from agamez/master

confuse: write to files without leaving spaces around equal sign.