feat(inputs.openstack): Allow collection without admin privileges

[srebhan]

Summary

Switch to gophercloud/v2 and simplify the code. This way, it becomes easier to use the plugin as non-admin and to maintain policies in OpenStack.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #11769

[powersj]

@srebhan FYI I pushed a go mod tidy so you could get artifacts over night

[telegraf-tiger]

Download PR build artifacts for linux_amd64.tar.gz, darwin_arm64.tar.gz, and windows_amd64.zip.
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☺️ This pull request doesn't significantly change the Telegraf binary size (less than 1%)

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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_arm64.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz	windows_i386.zip
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

[rplevka]

tested in a restricted OSP environment (no cluster admin permissions, just project admin) and it seems to work great:

$ ./telegraf --config ~/work/playground/telegraf/tg_osp.conf --test --debug
2024-06-10T18:46:42Z I! Loading config: /home/rplevka/work/playground/telegraf/tg_osp.conf
2024-06-10T18:46:42Z I! Starting Telegraf 1.32.0-3f9c982d brought to you by InfluxData the makers of InfluxDB
2024-06-10T18:46:42Z I! Available plugins: 234 inputs, 9 aggregators, 32 processors, 26 parsers, 60 outputs, 6 secret-stores
2024-06-10T18:46:42Z I! Loaded inputs: openstack
2024-06-10T18:46:42Z I! Loaded aggregators: 
2024-06-10T18:46:42Z I! Loaded processors:
2024-06-10T18:46:42Z I! Loaded secretstores:
2024-06-10T18:46:42Z W! Outputs are not used in testing mode!
2024-06-10T18:46:42Z I! Tags enabled: host=rplevka-t14s
2024-06-10T18:46:42Z D! [agent] Initializing plugins
2024-06-10T18:46:42Z D! [agent] Starting service inputs
> openstack_server,flavor=abcde0123-2c2d-1234-bad0-11234a0f9aea,host=rplevka-t14s,host_id=f6f8760df4b7b1334cb96a5baae8a190880a5d32f76893b044132d11,host_name=f6f8760df4b7b1334cb96a5baae8a190880a5d32f76893b044132d11,image=b6ad68d8-6022-4440-9190-2a7cef81f4bd,key_name=jenkins,name=vm1-rhel8.10-19e6533d,project=project1,status=active,tenant_id=7880c02ac32d46eaa3d306fd1b10e5b3 accessIPv4="",accessIPv6="",addresses=1i,created=1718044335000000000i,disk_gb=100i,fault_code=0i,fault_created=-6795364578871345152i,fault_details="",fault_message="",id="6f6ec454-6287-46eb-9297-aa636da1dd29",progress=0i,ram_mb=24576i,security_groups=1i,updated=1718044407000000000i,vcpus=6i,volumes_attached=0i 1718045210000000000

used config (redacted):

[[inputs.openstack]]
    authentication_endpoint = "https://foo.bar:13000"
    domain = "baz.com"
    project = "project1"
    username = "user"
    password = "pass"
    timeout = "60s"

    enabled_services = ["servers"]
    query_all_tenants = false

[powersj]

Sadly we still have no tests. I see that the reporter confirmed it works for his requested behavior, however it would be nice to know that this does not regress the current behavior as well.