feat: added "allow_reauth" config option for openstack client

[singamSrikar]

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• Updated associated README.md.
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resolves #

This solves the issue of "unauthorised access" because of Openstack API access token expiration.

[singamSrikar]

@powersj Hey, please review this PR.

[srebhan]

Thanks for this fix @singamSrikar! I wonder if the current behavior is really wanted or if this is simply a bug that should be fixed!?

[telegraf-tiger]

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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_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

[singamSrikar]

@srebhan updated the code with suggestions, please review. Thanks.

[srebhan]

Looks good to me. Thanks for the quick response @singamSrikar!