Fixed Helm plugin install and update from VCS

[mihaelrodek]

Signed-off-by: Mihael Rodek mihael.rodek1@gmail.com

closes #10929

What this PR does / why we need it: Fixes the plugin update and plugin install commands using better version handling
please refer to issue #10929 for more detailed explanation

Special notes for your reviewer: Plugin now prioritizes latest version over the cached one

e.g.
helm plugin install [options] <path|url>... now installs the latest version and not one fetched from cache
helm plugin update <plugin:[version]>... now allows user to specify to which version should plugin be updated to

[mihaelrodek]

Forgot to correct tests, on to it

[mihaelrodek]

@bacongobbler @hickeyma @mattfarina

Sorry for pinging you but since I'm still waiting on any comment for issue #10929, I'd like to address and comment this PR with any of you or anyone else contributing to Helm project

[mattfarina]

Thanks for the pull request. I have not done a full review. I just took a quick look and from that I had some feedback. Hope this helps you refine it.

[mihaelrodek]

@mattfarina did you take a second look on this PR? could I get any feedback please?

[mihaelrodek]

@bacongobbler @hickeyma @mattfarina

[arogulin]

@mihaelrodek thank you for fixing this issue, I just encountered it when I tried to update helm-diff and helm-secrets plugins. I hope it will get reviewed by somebody and finally merged.

[mihaelrodek]

Thanks @arogulin, this PR has been opened for year now but no actions have been taken so far, could maybe some of you take a look at it?

@mattfarina @marckhouzam @joejulian @jdolitsky @sabre1041 @scottrigby @technosophos @hickeyma
(sorry for pinging just trying to ping maintainers to take a look at it)