[server/session] remove json dumps around call_service This backouts changeset b151beea9cb6. With call_service being in-process and synchronous, there's no RPC use case.

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#! /bin/sh -e

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if [ -x "/etc/init.d/cubicweb-ctl" ]; then

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    invoke-rc.d cubicweb-ctl restart || true

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fi

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#DEBHELPER#

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exit 0