Add support for php 7.1

[pfz]

• add support for php7.1-fpm
• reload nginx instead of restart if already running

(package built and tested on debian 9.1, php 7.1.9)

[pfz]

Thanks for merging it. Though did I miss something in the build.sh for ajenti-v-php7.1-fpm for it to be added to the repo ? I see a build pass on the day of the merge. What's your process there ?

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