netplan have no --version option

[George Shuklin]

All software should support --help and --version command line options. netplan supports --help, but does not support --version. Moreover, it sets an error in exit code on calling with --version.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: netplan (not installed)
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Fri Jun 8 15:19:14 2018
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-xenial-amd64-20160624-2
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-06-22 (351 days ago)
InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
SourcePackage: plan
UpgradeStatus: No upgrade log present (probably fresh install)