[FS#516] procd doesn't wait for a process to quit during restart

[LEDE Bugs]

The following task has a new comment added:

FS#516 - procd doesn't wait for a process to quit during restart
User who did this - Hans Dedecker (dedeckeh)

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Patch https://patchwork.ozlabs.org/patch/726020/ tackles this issue
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=516#comment1811