Munin contributed plugins

mdpstats_: use 'stats' instead of 'version' in autoconf.

As of v0.21.4 version of the MPD command protocol, it seems that the
`version` command is not valid:

$ echo version | /bin/nc localhost 6600
    OK MPD 0.21.4
    ACK [5@0] {} unknown command "version"...

stratis: new plugin to monitor stratis filesystem

Plugin timesync_status: Fix KeyError when time is not synced

certificate_file_expiry: add pattern support for CERT env variable

Plugin timesync_status: use common pattern to check input args

systemd_status: fix autoconf to check if systemd is running

systemd_status: yet another plugin to monitor systemd status

Similar to systemd_units, but more states and ignores scopes and user
services. They must be allowed to fail.

Change proposed name, certbot_certs -> certbot_expiry

Plugin nextcloud_: fix shellcheck issues

[plugins/transmission] Python3 compat

Signed-off-by: Olivier Mehani <shtrom@ssji.net>

[plugins/nextcloud_] Only use one call to JQ to parse and report the info

Signed-off-by: Olivier Mehani <shtrom@ssji.net>

Plguin btcguild_hashrate_: migrate to Python3

Update shebang of Python3-compatible plugins to Python3

Plugin nutcracker_requests_: migrate to Python3, format documentation

Plugin snmp__juniper_spu: migrate to Python3

Plugin mongo_btree: migrate to Python3, format documentation

Plugin nova_instance_: migrate to Python3, format documentation

Plugin swift-dispersion: migrate to Python3, format documentation

Plugin keystone_stats: migrate to Python3, format documentation

Plugin feinstaubsensor: prepare for multiple fields per sensor metric

Optional components of the Feinstaubsensor may provide alternative
values for specific metrics (e.g. a BME280 sensor measures humidity,
temperature and atmospheric pressure).

lxc_guests: Monitor randomly generated virtual ethernet devices

Merge pull request #1131 from kjetilho/varnish-update

Varnish update

make new script executable

add varnish5_ to support Varnish 5.x and 6.x

This plugin has been used at Redpill Linpro for some time now. It adds
some measurements compared to varnish4_ and removes some others.
There are enough changes that it is probably not worth it to try to
merge the code into a generic varnish4_ plugin handling 4, 5 and 6.

Plugins chrony_*: fix filename of example graph

Renamed files to match convention

Renamed examplegraphs to mathc onvention.

Typo fix in chrony_sourcestats

typo fixed

Added two Chrony pluggins and example graphs

Added chrony_ , a wildcard plugin to track sourcestats per indiviual time source
Added chrony_sourcestats, a plugin that displays the sourcestats characteristics for several timesources in one graph.
Added example graphs for both plugins.

[plugins/shorewall/shorewall_log] added plugin for monitoring shorewall blocks

Graphs the number of blocks done by shorewall, given a specific rule
suffix

Unify shebang for python scripts

avoid blocking in ssl_

Just in case there is a firewall dropping packages, this plugin
would block until the plugin timeout is reached. This change introduces
the possibility to configure a much lower individual timeout.

Plugin snmp__airport: port to python3

Added mulitgraph redis plugin

This is a replacement for the redis_ plugin

Changes in the replacement:

• Supports multiple redis instances
• Supports AWS elasticache and other environments where the CONFIG
  command is disabled
• Uses multigraph to separate graphs by instance

Unify more author names with special characters

Additionally an ambiguous line in the "author" section of a plugin was
removed in order to avoid confusion for the Munin Plugin Gallery parser.

Merge pull request #1087 from moisseev/freeipmi

Improve freeipmi plugin

Plugin loolwsd: categorization

• move the plugin to `libreoffice` (should be easier to find for most
  users)
• add the graph category "appserver"

Plugin moinmoin_pages: fix style issues

Plugin ag241-adsl: improve documentation formatting and add author

Improve documentation formatting of some plugins

Plugin ipt_basic_: convert documentation to perlpod format

Plugin battery_: convert documentation to perlpod format

Plugin rpi_temp: convert documentation to perlpod format

Plugin moinmoin_pages: migrate to python3

Plugin cpu_freq_1sec: convert documentation to perldoc format

Clarify a few copyright statements

Fix special character for author name (Kristian Lyngstøl)

Otherwise this author shows up with different spellings in the plugin
gallery.

Merge pull request #1002 from steveschnepp/dump_node

Dump node

Cleanup page decode

Signed-off-by: Nathaniel Clark <Nathaniel.Clark@misrule.us>

Merge both SB6183 plugins

Add more error handling for bad status from modem

Signed-off-by: Nathaniel Clark <Nathaniel.Clark@misrule.us>

Fix spelling in comments

Signed-off-by: Nathaniel Clark <Nathaniel.Clark@misrule.us>