fix(inputs.upsd): Move to new sample.conf style

[srebhan]

• Updated associated README.md.
• Wrote appropriate unit tests.
• Pull request title or commits are in conventional commit format

This PR moves inputs.upsd's sample-configuration to a sample.conf file and embeds the data into both the code and the README. By doing so, we fix the missing [[inputs.upsd]] header when generating Telegraf's sample-configuration (see comment in #9890).

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_amd64.tar.gz, and windows_amd64.zip.
Downloads for additional architectures and packages are available below.

☺️ This pull request doesn't significantly change the Telegraf binary size (less than 1%)

📦 Click here to get additional PR build artifacts

Artifact URLs

DEB	RPM	TAR GZ	ZIP
amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	darwin_arm64.tar.gz	windows_i386.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
		linux_mipsel.tar.gz
		linux_ppc64le.tar.gz
		linux_riscv64.tar.gz
		linux_s390x.tar.gz
		static_linux_amd64.tar.gz

[ostueker]

The plugins/inputs/upsd/sample.conf looks correct.

However the respective lines in etc/telegraf.conf are still missing the header.
I haven't looked onto telegraf's build-automation, but this may be because the telegraf.conf and telegraf_windows.conf are updated periodically by the @telegraf-tiger bot, which would only run after this PR has been merged.

[ostueker]

Forgot to tag @srebhan ^^ .

[srebhan]

The files will be auto-generated once this is merged IIRC. You can check by running telegraf config with this PR.

[ostueker]

Confirmed:

$ ./usr/bin/telegraf config | grep -A 6 "Network UPS Tools" 
# # Monitor UPSes connected via Network UPS Tools
# [[inputs.upsd]]
#   ## A running NUT server to connect to.
#   # server = "127.0.0.1"
#   # port = 3493
#   # username = "user"
#   # password = "password"

LGTM

(looking forward to the next release ;-) )