Plugin lxc: move to category "virtualization"
See http://guide.munin-monitoring.org/en/latest/reference/graph-category.html#well-known-categories
Plugin lxc: enable "set -eu" for better error handling
The code should be suitable for "exit-on-error" and "error-on-unset".
Plugin lxc: verify the availability of "lxc-ls"
Previously "autoconf" only verified, that /var/lib/lxc exists. But thiscould be just a remainder of a formerly installed lxc package.
Plugin lxc: add support for MUNIN_CAP_DIRTYCONFIG
Plugin lxc: use functions for top-level activities
This clarifies the flow of control and allows to useMUNIN_CAP_DIRTYCONFIG later.
Plugin lxc: clarify name for function "active_guests"
Previously a variable and a function used the same name.This was no problem, but it can cause confusion.
Plugin lxc: change the plugin from "bash" to "sh"
No more bashisms were left.
Plugin lxc: separate function for title beautification
This avoids a bashism.
Plugin lxc: simplify interface of "lxc_cgroup" and rename function
Plugin lxc: use comprehensible names for variables
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