Fixes #7203: fusionAgent.cf for ARM

[frbayart]

• remove hidden charaters
• avoid dmidecode usage on armv6l and armv7l but read Serial line in /proc/cpuinfo

[peckpeck]

thanks for these :)

[peckpeck]

Thank you, that's good to see new contributor and see a quality patch.
Would you be kind enough to correct the $() for the correctness nazi I am ?
Otherwise I will do it during merge.
If you are using rudder-dev, it's a matter of: edit file; git add file; rudder-dev amend

[peckpeck]

We'd like you to sign one of our CLA:

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You can find in our wiki the reason we ask for it http://www.rudder-project.org/foswiki/Development/HowToContribute#Why_must_I_sign_a_CLA_63_Do_you_want_to_make_money_with_my_code_63

Thanks again for contributing.

[frbayart]

I have replaced $() to ${}

[peckpeck]

Hello @frbayart.
Tince this PR cannot be merged anymore, I took your commits and put them in a new PR #970
Thank you for your time