fix confusing dfx upgrade behavior

[p-shahi]

Why do we encourage the user to run dfx upgrade, and then install the cache? Should we not install the cache, check if this is the latest release, and then encourage them to upgrade if it isn't?

After some careful reading we think we understand everything that happened.

We note that Aimee already had version dfx 0.6.20 installed, but that dfx said it updated to 0.6.20. We don’t know if anything changed about dfx or if it just got confused and reinstalled itself.

We try the suggested dfx upgrade, and as we expected it does nothing. So dfx new firsttest suggested we run a command, then ran that command for us, and when we ran the suggested command, it did nothing.

Now we are curious about how the output of dfx new firsttest will change if we run it again, without requiring an update, so we delete the new “firsttest” directory and try again:

$ dfx new firsttest
Fetching manifest https://sdk.dfinity.org/manifest.json
Creating new project "firsttest"...
CREATE       firsttest/src/firsttest_assets/assets/sample-asset.txt (24B)...
CREATE       firsttest/src/firsttest/main.mo (107B)...
CREATE       firsttest/dfx.json (484B)...
CREATE       firsttest/.gitignore (165B)...
CREATE       firsttest/README.md (1.16KB)...
CREATE       firsttest/src/firsttest_assets/public/index.js (149B)...
CREATE       firsttest/package.json (288B)...
CREATE       firsttest/webpack.config.js (2.15KB)...
⠒ Installing node dependencies...
⠁ Installing node dependencies...
npm WARN deprecated resolve-url@0.2.1: https://github.com/lydell/resolve-url#deprecated
⠁ Installing node dependencies...
⠋ Installing node dependencies...

> fsevents@1.2.13 install /Users/aimeez/github/dfinity-project/firsttest/node_modules/watchpack-chokidar2/node_modules/fsevents
> node install.js
⠒ Installing node dependencies...
⠲ Installing node dependencies...
⠉ Installing node dependencies...
⠲ Installing node dependencies...
npm WARN firsttest_assets@0.1.0 No repository field.
npm WARN firsttest_assets@0.1.0 No license field.

⠄ Installing node dependencies...

13 packages are looking for funding
  run `npm fund` for details

found 1 high severity vulnerability
⠄ Installing node dependencies...


   ╭─────────────────────────────────────────────────────────────────╮
   │                                                                 │
   │      New patch version of npm available! 6.14.8 → 6.14.11       │
   │   Changelog: https://github.com/npm/cli/releases/tag/v6.14.11   │
   │                Run npm install -g npm to update!                │
   │                                                                 │
   ╰─────────────────────────────────────────────────────────────────╯
  Done.
Creating git repository...

===============================================================================
        Welcome to the internet computer developer community!
                        You're using dfx 0.6.20

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To learn more before you start coding, see the documentation available online:

- Quick Start: https://sdk.dfinity.org/docs/quickstart/quickstart-intro.html
- SDK Developer Tools: https://sdk.dfinity.org/docs/developers-guide/sdk-guide.html
- Motoko Language Guide: https://sdk.dfinity.org/docs/language-guide/motoko.html
- Motoko Quick Reference: https://sdk.dfinity.org/docs/language-guide/language-manual.html

If you want to work on programs right away, try the following commands to get started:

    cd firsttest
    dfx help
    dfx new --help

===============================================================================

So nothing about checking for updates this time. Good. It still has a problem with its spinner+status message output, where “Installing node dependencies…” is printed repeatedly.

This is on a Mac, so perhaps it’s a platform-specific bug.

[lwshang]

In #1357 (comment) , I talked about some idea relevant to this issue.

Probably every new user may wondering: what can I expect after run that one-liner.

1. The latest full toolchain?
2. A version manager?

From my current understanding, the dfx is none of above. I would suggest to always install the full toolchain during the installation. This will be more intuitive.

[sesi200]

Also merging #1357 into this