[FS#900] luci-app-acme: uninstalling leaves "ACME certs" in Services menu of luci

[LEDE Bugs]

The following task has a new comment added:

FS#900 - luci-app-acme: uninstalling leaves "ACME certs" in Services menu of luci
User who did this - Mathias Kresin (mkresin)

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One of the the LuCI cache file in /tmp/luci-* needs to be purged after removing luci-app-acme. But that is the package job.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=900#comment2961