[Commotion-admin] [luci-commotion] added validation and sanitizing functions for mitigating RCE vulnerabilities (#29)

[dismantl]

added new commit part of fix for https://github.com/opentechinstitute/luci-commotion-apps/issues/12

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion/pull/29#issuecomment-26603161
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